diff --git a/hel/Cargo.toml b/hel/Cargo.toml
index 177232f..efe70fb 100644
--- a/hel/Cargo.toml
+++ b/hel/Cargo.toml
@@ -22,6 +22,7 @@ base64 = "0.20.0"
 shlex = "1.1.0"
 shellexpand = "3.0.0"
 scopeguard = "1.1.0"
+parking_lot = { version = "0.12.1", features = ["deadlock_detection"] }
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 chrono = "0.4.23"
diff --git a/hel/src/commands.rs b/hel/src/commands.rs
index d26984b..29f3421 100644
--- a/hel/src/commands.rs
+++ b/hel/src/commands.rs
@@ -11,14 +11,14 @@ use crate::password::fix_password_recursion;
 use crate::password::{Name, Password, PasswordRef};
 use crate::repl::LKEval;
 use crate::structs::{LKOut, Radix, CORRECT_FILE, DUMP_FILE};
-use crate::utils::{call_cmd_with_input, get_cmd_args_from_command, get_copy_command_from_env, rnd};
 use crate::utils::editor::password;
+use crate::utils::{call_cmd_with_input, get_cmd_args_from_command, get_copy_command_from_env, rnd};
 
 impl<'a> LKEval<'a> {
     pub fn get_password(&self, name: &String) -> Option<PasswordRef> {
-        match self.state.borrow().ls.get(name) {
+        match self.state.lock().borrow().ls.get(name) {
             Some(pwd) => Some(pwd.clone()),
-            None => match self.state.borrow().db.get(name) {
+            None => match self.state.lock().borrow().db.get(name) {
                 Some(pwd) => Some(pwd.clone()),
                 None => None,
             },
@@ -34,15 +34,15 @@ impl<'a> LKEval<'a> {
                 None => (),
             }
         }
-        let parent = match &pwd.borrow().parent {
-            Some(p) => p.borrow().name.to_string(),
+        let parent = match &pwd.lock().borrow().parent {
+            Some(p) => p.lock().borrow().name.to_string(),
             None => "/".to_string(),
         };
-        let secret = match self.state.borrow().secrets.get(&parent) {
+        let secret = match self.state.lock().borrow().secrets.get(&parent) {
             Some(p) => Some(p.clone()),
             None => None,
         };
-        match (pwd.borrow().parent.clone(), secret) {
+        match (pwd.lock().borrow().parent.clone(), secret) {
             (_, Some(s)) => Some(s.to_string()),
             (None, None) => {
                 if read {
@@ -50,7 +50,7 @@ impl<'a> LKEval<'a> {
                         Ok(password) => {
                             let name = "/".to_string();
                             self.cmd_correct(&out, &name, true, Some(password.clone()));
-                            self.state.borrow_mut().secrets.insert(name, password.clone());
+                            self.state.lock().borrow_mut().secrets.insert(name, password.clone());
                             Some(password)
                         }
                         Err(_) => None,
@@ -61,22 +61,22 @@ impl<'a> LKEval<'a> {
             }
             (Some(pn), None) => {
                 let password = if read {
-                    (self.read_password)(format!("Password for {}: ", pn.borrow().name)).ok()
+                    (self.read_password)(format!("Password for {}: ", pn.lock().borrow().name)).ok()
                 } else {
                     None
                 };
                 if password.is_some() && password.as_ref().unwrap().len() > 0 {
-                    let name = pn.borrow().name.to_string();
+                    let name = pn.lock().borrow().name.to_string();
                     self.cmd_correct(&out, &name, true, Some(password.as_ref().unwrap().clone()));
-                    self.state.borrow_mut().secrets.insert(name, password.as_ref().unwrap().clone());
+                    self.state.lock().borrow_mut().secrets.insert(name, password.as_ref().unwrap().clone());
                     password
                 } else {
                     match self.read_master(&out, pn.clone(), read) {
                         Some(master) => {
-                            let password = pn.borrow().encode(master.as_str());
-                            let name = pn.borrow().name.to_string();
+                            let password = pn.lock().borrow().encode(master.as_str());
+                            let name = pn.lock().borrow().name.to_string();
                             self.cmd_correct(&out, &name, true, Some(password.to_string()));
-                            self.state.borrow_mut().secrets.insert(name, password.clone());
+                            self.state.lock().borrow_mut().secrets.insert(name, password.clone());
                             Some(password)
                         }
                         None => None,
@@ -87,15 +87,15 @@ impl<'a> LKEval<'a> {
     }
 
     pub fn cmd_add(&self, out: &LKOut, name: &PasswordRef) {
-        let state = &mut self.state.borrow_mut();
+        let state_cell = self.state.lock();
+        let mut state = state_cell.borrow_mut();
         let mut fix = false;
         {
-            let db = &mut state.db;
-            let pwname = &name.borrow().name.to_string();
-            if db.get(pwname).is_some() {
+            let pwname = &name.lock().borrow().name.to_string();
+            if state.db.get(pwname).is_some() {
                 out.e(format!("error: password {} already exist", pwname));
             } else {
-                db.insert(pwname.to_string(), name.clone());
+                state.db.insert(pwname.to_string(), name.clone());
                 fix = true;
             }
         }
@@ -105,9 +105,12 @@ impl<'a> LKEval<'a> {
     }
 
     pub fn cmd_leave(&self, out: &LKOut, name: &Name) {
-        let pwd = match self.state.borrow().ls.get(name) {
+        let pwd = match self.state.lock().borrow().ls.get(name) {
             Some(pwd) => pwd.clone(),
-            None => { out.e(format!("error: {} not found", name)); return; }
+            None => {
+                out.e(format!("error: {} not found", name));
+                return;
+            }
         };
         self.cmd_add(&out, &pwd);
     }
@@ -116,11 +119,11 @@ impl<'a> LKEval<'a> {
         match self.get_password(name) {
             Some(pwd) => {
                 if folder == "/" {
-                    pwd.borrow_mut().parent = None
+                    pwd.lock().borrow_mut().parent = None
                 } else {
                     match self.get_password(folder) {
                         Some(fld) => {
-                            pwd.borrow_mut().parent = Some(fld.clone());
+                            pwd.lock().borrow_mut().parent = Some(fld.clone());
                             fix_password_recursion(pwd.clone());
                         }
                         None => out.e(format!("error: folder {} not found", folder)),
@@ -134,18 +137,15 @@ impl<'a> LKEval<'a> {
     pub fn cmd_pass(&self, out: &LKOut, name: &String) {
         match self.get_password(name) {
             Some(p) => {
-                let pwd = (self.read_password)(format!("Password for {}: ", p.borrow().name)).unwrap();
-                self.cmd_correct(&out, &p.borrow().name, true, Some(pwd.clone()));
-                self.state.borrow_mut().secrets.insert(p.borrow().name.to_string(), pwd);
+                let pwd = (self.read_password)(format!("Password for {}: ", p.lock().borrow().name)).unwrap();
+                self.cmd_correct(&out, &p.lock().borrow().name, true, Some(pwd.clone()));
+                self.state.lock().borrow_mut().secrets.insert(p.lock().borrow().name.to_string(), pwd);
             }
             None => {
                 if name == "/" {
                     let pwd = (self.read_password)("Master: ".to_string()).unwrap();
                     self.cmd_correct(&out, &"/".to_string(), true, Some(pwd.clone()));
-                    self.state
-                        .borrow_mut()
-                        .secrets
-                        .insert("/".to_string(), pwd);
+                    self.state.lock().borrow_mut().secrets.insert("/".to_string(), pwd);
                 } else {
                     out.e(format!("error: password with name {} not found", name));
                 }
@@ -156,7 +156,7 @@ impl<'a> LKEval<'a> {
     pub fn cmd_comment(&self, out: &LKOut, name: &String, comment: &Option<String>) {
         match self.get_password(name) {
             Some(pwd) => {
-                pwd.borrow_mut().comment = match comment {
+                pwd.lock().borrow_mut().comment = match comment {
                     Some(c) => Some(c.to_string()),
                     None => None,
                 }
@@ -167,8 +167,8 @@ impl<'a> LKEval<'a> {
 
     pub fn cmd_enc(&self, out: &LKOut, name: &String) -> Option<(String, String)> {
         let root_folder = "/".to_string();
-        let (name, pass) = if name == "/" && self.state.borrow().secrets.contains_key(&root_folder) {
-            (root_folder.to_string(), self.state.borrow().secrets.get(&root_folder).unwrap().to_string())
+        let (name, pass) = if name == "/" && self.state.lock().borrow().secrets.contains_key(&root_folder) {
+            (root_folder.to_string(), self.state.lock().borrow().secrets.get(&root_folder).unwrap().to_string())
         } else {
             let pwd = match self.get_password(name) {
                 Some(p) => p.clone(),
@@ -177,12 +177,12 @@ impl<'a> LKEval<'a> {
                     return None;
                 }
             };
-            let name = pwd.borrow().name.to_string();
-            if self.state.borrow().secrets.contains_key(&name) {
-                (name.clone(), self.state.borrow().secrets.get(&name).unwrap().to_string())
+            let name = pwd.lock().borrow().name.to_string();
+            if self.state.lock().borrow().secrets.contains_key(&name) {
+                (name.clone(), self.state.lock().borrow().secrets.get(&name).unwrap().to_string())
             } else {
                 match self.read_master(&out, pwd.clone(), true) {
-                    Some(sec) => (name.clone(), pwd.borrow().encode(sec.as_str())),
+                    Some(sec) => (name.clone(), pwd.lock().borrow().encode(sec.as_str())),
                     None => {
                         out.e(format!("error: master for {} not found", name));
                         return None;
@@ -253,7 +253,9 @@ impl<'a> LKEval<'a> {
                 for cmd in cmd_list {
                     let print = LKEval::new(cmd, self.state.clone(), password).eval();
                     print.out.copy(&out);
-                    if print.quit { return true; }
+                    if print.quit {
+                        return true;
+                    }
                 }
             }
             Err(e) => {
@@ -273,9 +275,9 @@ impl<'a> LKEval<'a> {
             let file = fs::File::create(script)?;
             let mut writer = BufWriter::new(file);
             let mut vals = data.values().map(|v| v.clone()).collect::<Vec<PasswordRef>>();
-            vals.sort_by(|a, b| a.borrow().name.cmp(&b.borrow().name));
+            vals.sort_by(|a, b| a.lock().borrow().name.cmp(&b.lock().borrow().name));
             for pwd in vals {
-                writeln!(writer, "add {}", pwd.borrow().to_string())?
+                writeln!(writer, "add {}", pwd.lock().borrow().to_string())?
             }
             Ok(())
         }
@@ -289,10 +291,11 @@ impl<'a> LKEval<'a> {
             };
             let data = self
                 .state
+                .lock()
                 .borrow()
                 .db
                 .values()
-                .map(|v| format!("add {}", v.borrow().to_string()))
+                .map(|v| format!("add {}", v.lock().borrow().to_string()))
                 .collect::<Vec<String>>()
                 .join("\n");
             let output = match call_cmd_with_input(&cmd, &args, data.as_str()) {
@@ -309,13 +312,13 @@ impl<'a> LKEval<'a> {
                 out.o(format!("Passwords saved to command {}", cmd));
             }
         } else if script.trim() == "-" {
-            let mut vals = (&self.state.borrow().db).values().map(|v| v.clone()).collect::<Vec<PasswordRef>>();
-            vals.sort_by(|a, b| a.borrow().name.cmp(&b.borrow().name));
+            let mut vals = (&self.state.lock().borrow().db).values().map(|v| v.clone()).collect::<Vec<PasswordRef>>();
+            vals.sort_by(|a, b| a.lock().borrow().name.cmp(&b.lock().borrow().name));
             for pwd in vals {
-                out.o(format!("add {}", pwd.borrow().to_string()))
-            };
+                out.o(format!("add {}", pwd.lock().borrow().to_string()))
+            }
         } else {
-            match save_dump(&self.state.borrow().db, &script) {
+            match save_dump(&self.state.lock().borrow().db, &script) {
                 Ok(()) => out.o(format!("Passwords saved to file {}", script)),
                 Err(e) => out.e(format!("error: failed to dump passswords to {}: {}", script, e.to_string())),
             };
@@ -334,24 +337,26 @@ impl<'a> LKEval<'a> {
             }
         };
         let mut tmp: Vec<PasswordRef> = vec![];
-        for (_, name) in &self.state.borrow().db {
-            if re.find(&name.borrow().to_string()).is_some() {
+        for (_, name) in &self.state.lock().borrow().db {
+            if re.find(&name.lock().borrow().to_string()).is_some() {
                 tmp.push(name.clone());
-            } else if re.find(&name.borrow().name).is_some() {
+            } else if re.find(&name.lock().borrow().name).is_some() {
                 tmp.push(name.clone());
-            } else if name.borrow().comment.is_some() && re.find(&name.borrow().comment.as_ref().unwrap()).is_some() {
+            } else if name.lock().borrow().comment.is_some()
+                && re.find(&name.lock().borrow().comment.as_ref().unwrap()).is_some()
+            {
                 tmp.push(name.clone());
             }
         }
-        tmp.sort_by(|a,b| a.borrow().name.cmp(&b.borrow().name));
+        tmp.sort_by(|a, b| a.lock().borrow().name.cmp(&b.lock().borrow().name));
         tmp.sort_by(sort_by);
-        self.state.borrow_mut().ls.clear();
+        self.state.lock().borrow_mut().ls.clear();
         let mut counter = 1;
         for pwd in tmp {
             let key = Radix::new(counter, 36).unwrap().to_string();
             counter += 1;
-            self.state.borrow_mut().ls.insert(key.clone(), pwd.clone());
-            out.o(format!("{:>3} {}", key, pwd.borrow().to_string()));
+            self.state.lock().borrow_mut().ls.insert(key.clone(), pwd.clone());
+            out.o(format!("{:>3} {}", key, pwd.lock().borrow().to_string()));
         }
     }
 
@@ -435,42 +440,42 @@ impl<'a> LKEval<'a> {
             static ref RE: Regex = Regex::new(r"^.+?(G+|X+)$").unwrap();
         }
         let num: usize = (*num).try_into().unwrap();
-        let pwd = name.borrow();
+        let pwd = name.lock();
         let mut genpwds: Vec<PasswordRef> = Vec::new();
-        match RE.captures(pwd.name.as_ref()) {
+        match RE.captures(pwd.borrow().name.as_ref()) {
             Some(caps) => {
                 let gen = &caps[1];
                 if gen.starts_with("G") {
-                    let name = pwd.name.trim_end_matches('G');
+                    let name = pwd.borrow().name.trim_end_matches('G').to_string();
                     for num in 1..10_u32.pow(gen.len().try_into().unwrap()) {
-                        let npwd = Password::from_password(&pwd);
-                        npwd.borrow_mut().name = format!("{}{}", name, num).to_string();
+                        let npwd = Password::from_password_ref(&pwd.borrow());
+                        npwd.lock().borrow_mut().name = format!("{}{}", name, num).to_string();
                         genpwds.push(npwd);
                     }
                 } else {
-                    let name = pwd.name.trim_end_matches('X');
+                    let name = pwd.borrow().name.trim_end_matches('X').to_string();
                     let num = rnd::range(1, 10_u32.pow(gen.len().try_into().unwrap()));
-                    let npwd = Password::from_password(&pwd);
-                    npwd.borrow_mut().name = format!("{}{}", name, num).to_string();
+                    let npwd = Password::from_password_ref(&pwd.borrow());
+                    npwd.lock().borrow_mut().name = format!("{}{}", name, num).to_string();
                     genpwds.push(npwd);
                 }
             }
             None => {
-                let npwd = Password::from_password(&pwd);
+                let npwd = Password::from_password_ref(&pwd.borrow());
                 genpwds.push(npwd);
             }
         }
-        self.state.borrow_mut().ls.clear();
+        self.state.lock().borrow_mut().ls.clear();
         let mut counter = 1;
         let mut lspwds: Vec<(PasswordRef, String)> = Vec::new();
         for num in 0..genpwds.len() {
             let pwd = genpwds[num].clone();
             let key = Radix::new(counter, 36).unwrap().to_string();
             counter += 1;
-            self.state.borrow_mut().ls.insert(key.to_string(), pwd.clone());
+            self.state.lock().borrow_mut().ls.insert(key.to_string(), pwd.clone());
             lspwds.push((pwd, key));
         }
-        self.state.borrow().fix_hierarchy();
+        self.state.lock().borrow().fix_hierarchy();
         let mut err = match &out.err {
             Some(e) => Some(e.clone()),
             None => None,
@@ -479,8 +484,8 @@ impl<'a> LKEval<'a> {
         for (pwd, key) in lspwds {
             let pass = match self.cmd_enc(&LKOut::from_lkout(None, err), &key) {
                 Some((name, pass)) => {
-                    if name != pwd.borrow().name {
-                        panic!("INTERNAL_ERROR: wrong name found: {} != {}", name, pwd.borrow().name);
+                    if name != pwd.lock().borrow().name {
+                        panic!("INTERNAL_ERROR: wrong name found: {} != {}", name, pwd.lock().borrow().name);
                     };
                     pass
                 }
@@ -493,15 +498,15 @@ impl<'a> LKEval<'a> {
             encpwds.push((pwd.clone(), pass));
         }
         encpwds.sort_by(|a, b| b.1.len().cmp(&a.1.len()));
-        self.state.borrow_mut().ls.clear();
+        self.state.lock().borrow_mut().ls.clear();
         let mut counter = 1;
         out.o(format!("{:>3} {:>36} {:>4}       {}", "", "Password", "Len", "Name"));
         for num in (encpwds.len() - min(genpwds.len(), num))..encpwds.len() {
             let (pwd, pass) = (encpwds[num].0.clone(), encpwds[num].1.to_string());
             let key = Radix::new(counter, 36).unwrap().to_string();
             counter += 1;
-            self.state.borrow_mut().ls.insert(key.clone(), pwd.clone());
-            out.o(format!("{:>3} {:>36} {:>4} {}", key, pass, pass.len(), pwd.borrow().to_string()));
+            self.state.lock().borrow_mut().ls.insert(key.clone(), pwd.clone());
+            out.o(format!("{:>3} {:>36} {:>4} {}", key, pass, pass.len(), pwd.lock().borrow().to_string()));
         }
     }
 }
diff --git a/hel/src/lib.rs b/hel/src/lib.rs
index f9c8565..119fb98 100644
--- a/hel/src/lib.rs
+++ b/hel/src/lib.rs
@@ -12,4 +12,3 @@ pub mod repl;
 pub mod skey;
 pub mod structs;
 pub mod utils;
-
diff --git a/hel/src/lk.rs b/hel/src/lk.rs
index aae9bad..d1a10ab 100644
--- a/hel/src/lk.rs
+++ b/hel/src/lk.rs
@@ -1,8 +1,13 @@
 use crate::password::{fix_password_recursion, Name, PasswordRef};
+use parking_lot::ReentrantMutex;
 use regex::{Captures, Regex};
+use std::cell::RefCell;
 use std::collections::HashMap;
+use std::sync::Arc;
 
-#[derive(PartialEq, Debug)]
+pub type LKRef = Arc<ReentrantMutex<RefCell<LK>>>;
+
+#[derive(Debug)]
 pub struct LK {
     pub db: HashMap<Name, PasswordRef>,
     pub ls: HashMap<String, PasswordRef>,
@@ -24,7 +29,7 @@ impl LK {
         }
         for db in vec![&self.db, &self.ls] {
             for (_, name) in db {
-                let comment = name.borrow().comment.clone();
+                let comment = name.lock().borrow().comment.clone();
                 match comment {
                     Some(comment) => {
                         let mut changed = false;
@@ -33,7 +38,7 @@ impl LK {
                                 let folder = c[1].to_string();
                                 match self.db.get(&folder) {
                                     Some(entry) => {
-                                        name.borrow_mut().parent = Some(entry.clone());
+                                        name.lock().borrow_mut().parent = Some(entry.clone());
                                         changed = true;
                                     }
                                     None => (),
@@ -43,7 +48,7 @@ impl LK {
                             .trim()
                             .to_string();
                         if changed && new != comment {
-                            name.borrow_mut().comment = if new.len() > 0 { Some(new) } else { None }
+                            name.lock().borrow_mut().comment = if new.len() > 0 { Some(new) } else { None }
                         }
                     }
                     None => (),
@@ -53,3 +58,22 @@ impl LK {
         }
     }
 }
+
+impl PartialEq for LK {
+    fn eq(&self, other: &Self) -> bool {
+        if self.db.len() != other.db.len() || self.ls.len() != other.ls.len() || self.secrets != other.secrets {
+            return false;
+        }
+        for (k, v) in &self.db {
+            if !other.db.contains_key(k) || *other.db[k].lock() != *v.lock() {
+                return false;
+            }
+        }
+        for (k, v) in &self.ls {
+            if !other.ls.contains_key(k) || *other.ls[k].lock() != *v.lock() {
+                return false;
+            }
+        }
+        true
+    }
+}
diff --git a/hel/src/parser.rs b/hel/src/parser.rs
index b197516..a891fda 100644
--- a/hel/src/parser.rs
+++ b/hel/src/parser.rs
@@ -3,7 +3,6 @@ extern crate peg;
 use crate::password::Password;
 use crate::structs::{Command, LKErr, Mode};
 use crate::utils::date::Date;
-use std::{cell::RefCell, rc::Rc};
 
 peg::parser! {
     pub grammar command_parser() for str {
@@ -89,10 +88,10 @@ peg::parser! {
         rule source_cmd() -> Command<'input> = "source" _ s:$(([' '..='~'])+) { Command::Source(s.to_string()) }
         rule ls_cmd() -> Command<'input> = "ls" f:comment()? { Command::Ls(f.unwrap_or(".".to_string())) }
         rule ld_cmd() -> Command<'input> = "ld" f:comment()? { Command::Ld(f.unwrap_or(".".to_string())) }
-        rule add_cmd() -> Command<'input> = "add" _ name:name() { Command::Add(Rc::new(RefCell::new(name))) }
+        rule add_cmd() -> Command<'input> = "add" _ name:name() { Command::Add(Password::from_password(name)) }
         rule leave_cmd() -> Command<'input> = "leave" _ name:word() { Command::Leave(name.to_string()) }
         rule gen_cmd() -> Command<'input> = "gen" n:num()? _ name:name() {
-            Command::Gen(match n { Some(n) => n, None => 10_u32 }, Rc::new(RefCell::new(name)))
+            Command::Gen(match n { Some(n) => n, None => 10_u32 }, Password::from_password(name))
         }
         rule error_cmd() -> Command<'input> = "error" _ e:$(([' '..='~'])+) { Command::Error(LKErr::Error(e)) }
         rule mv_cmd() -> Command<'input> = "mv" _ name:word() _ folder:word() { Command::Mv(name, folder) }
@@ -119,7 +118,7 @@ add t2 C 99 2022-12-14
 add t3 C 99 2022-12-14"###
             ),
             Ok(vec![
-                Command::Add(Rc::new(RefCell::new(Password {
+                Command::Add(Password::from_password(Password {
                     parent: None,
                     prefix: None,
                     name: "t1".to_string(),
@@ -128,8 +127,8 @@ add t3 C 99 2022-12-14"###
                     seq: 99,
                     date: Date::new(2022, 12, 14),
                     comment: None
-                }))),
-                Command::Add(Rc::new(RefCell::new(Password {
+                })),
+                Command::Add(Password::from_password(Password {
                     parent: None,
                     prefix: None,
                     name: "t2".to_string(),
@@ -138,8 +137,8 @@ add t3 C 99 2022-12-14"###
                     seq: 99,
                     date: Date::new(2022, 12, 14),
                     comment: None
-                }))),
-                Command::Add(Rc::new(RefCell::new(Password {
+                })),
+                Command::Add(Password::from_password(Password {
                     parent: None,
                     prefix: None,
                     name: "t3".to_string(),
@@ -148,7 +147,7 @@ add t3 C 99 2022-12-14"###
                     seq: 99,
                     date: Date::new(2022, 12, 14),
                     comment: None
-                })))
+                }))
             ])
         );
         assert_eq!(
@@ -159,7 +158,7 @@ add t3 C 99 2022-12-14
 "###
             ),
             Ok(vec![
-                Command::Add(Rc::new(RefCell::new(Password {
+                Command::Add(Password::from_password(Password {
                     parent: None,
                     prefix: None,
                     name: "t1".to_string(),
@@ -168,8 +167,8 @@ add t3 C 99 2022-12-14
                     seq: 99,
                     date: Date::new(2022, 12, 14),
                     comment: None
-                }))),
-                Command::Add(Rc::new(RefCell::new(Password {
+                })),
+                Command::Add(Password::from_password(Password {
                     parent: None,
                     prefix: None,
                     name: "t2".to_string(),
@@ -178,8 +177,8 @@ add t3 C 99 2022-12-14
                     seq: 99,
                     date: Date::new(2022, 12, 14),
                     comment: None
-                }))),
-                Command::Add(Rc::new(RefCell::new(Password {
+                })),
+                Command::Add(Password::from_password(Password {
                     parent: None,
                     prefix: None,
                     name: "t3".to_string(),
@@ -188,7 +187,7 @@ add t3 C 99 2022-12-14
                     seq: 99,
                     date: Date::new(2022, 12, 14),
                     comment: None
-                }))),
+                })),
                 Command::Noop
             ])
         );
@@ -201,7 +200,7 @@ add t3 C 99 2022-12-14
 "###
             ),
             Ok(vec![
-                Command::Add(Rc::new(RefCell::new(Password {
+                Command::Add(Password::from_password(Password {
                     parent: None,
                     prefix: None,
                     name: "t1".to_string(),
@@ -210,8 +209,8 @@ add t3 C 99 2022-12-14
                     seq: 99,
                     date: Date::new(2022, 12, 14),
                     comment: None
-                }))),
-                Command::Add(Rc::new(RefCell::new(Password {
+                })),
+                Command::Add(Password::from_password(Password {
                     parent: None,
                     prefix: None,
                     name: "t2".to_string(),
@@ -220,8 +219,8 @@ add t3 C 99 2022-12-14
                     seq: 99,
                     date: Date::new(2022, 12, 14),
                     comment: None
-                }))),
-                Command::Add(Rc::new(RefCell::new(Password {
+                })),
+                Command::Add(Password::from_password(Password {
                     parent: None,
                     prefix: None,
                     name: "t3".to_string(),
@@ -230,7 +229,7 @@ add t3 C 99 2022-12-14
                     seq: 99,
                     date: Date::new(2022, 12, 14),
                     comment: None
-                }))),
+                })),
                 Command::Noop,
                 Command::Noop
             ])
diff --git a/hel/src/password.rs b/hel/src/password.rs
index 9a7376f..f56e2ea 100644
--- a/hel/src/password.rs
+++ b/hel/src/password.rs
@@ -1,17 +1,19 @@
 use crate::skey::SKey;
 use crate::structs::Mode;
 use crate::utils::date::Date;
-use std::{cell::RefCell, rc::Rc};
+use parking_lot::ReentrantMutex;
+use std::cell::RefCell;
+use std::sync::Arc;
 
 pub type Name = String;
 pub type Prefix = Option<String>;
 pub type Comment = Option<String>;
-pub type PasswordRef = Rc<RefCell<Password>>;
+pub type PasswordRef = Arc<ReentrantMutex<RefCell<Password>>>;
 pub type Parent = Option<PasswordRef>;
 pub type Length = Option<u32>;
 pub type Seq = u32;
 
-#[derive(PartialEq, Debug)]
+#[derive(Debug)]
 pub struct Password {
     pub parent: Parent,
     pub prefix: Prefix,
@@ -45,8 +47,8 @@ impl Password {
         }
     }
 
-    pub fn from_password(password: &Password) -> PasswordRef {
-        Rc::new(RefCell::new(Self {
+    pub fn from_password_ref(password: &Password) -> PasswordRef {
+        Arc::new(ReentrantMutex::new(RefCell::new(Self {
             parent: password.parent.clone(),
             prefix: password.prefix.clone(),
             name: password.name.clone(),
@@ -55,7 +57,11 @@ impl Password {
             seq: password.seq,
             date: password.date.clone(),
             comment: password.comment.clone(),
-        }))
+        })))
+    }
+
+    pub fn from_password(password: Password) -> PasswordRef {
+        Arc::new(ReentrantMutex::new(RefCell::new(password)))
     }
 
     pub fn encode(&self, secret: &str) -> String {
@@ -109,13 +115,28 @@ impl std::string::ToString for Password {
             None => "".to_string(),
         };
         let parent = match &self.parent {
-            Some(s) => format!(" ^{}", s.borrow().name),
+            Some(s) => format!(" ^{}", s.lock().borrow().name),
             None => "".to_string(),
         };
         format!("{:>6}{} {}{} {} {}{}{}", prefix, self.name, length, self.mode, self.seq, self.date, comment, parent)
     }
 }
 
+impl PartialEq for Password {
+    fn eq(&self, other: &Self) -> bool {
+        self.name == other.name
+            && match (&self.parent, &other.parent) {
+                (Some(s), Some(o)) => *s.lock() == *o.lock(),
+                (None, None) => true,
+                _ => false,
+            }
+            && self.prefix == other.prefix
+            && self.length == other.length
+            && self.mode == other.mode
+            && self.seq == other.seq
+    }
+}
+
 fn camel_case(words: [&str; 6]) -> String {
     let mut camel_case_string = String::new();
 
@@ -128,34 +149,34 @@ fn camel_case(words: [&str; 6]) -> String {
     camel_case_string
 }
 
-pub fn fix_password_recursion(entry: Rc<RefCell<Password>>) {
+pub fn fix_password_recursion(entry: PasswordRef) {
     let mut t1 = entry.clone();
     let mut t2 = entry;
-    let mut t3: Option<Rc<RefCell<Password>>> = None;
+    let mut t3: Option<PasswordRef> = None;
     loop {
-        t2 = match &t2.clone().borrow().parent {
+        t2 = match &t2.clone().lock().borrow().parent {
             Some(o) => o.clone(),
             None => break,
         };
-        if std::ptr::eq(&*t1.borrow(), &*t2.borrow()) {
+        if std::ptr::eq(&*t1.lock().borrow(), &*t2.lock().borrow()) {
             t3 = Some(t2.clone());
             break;
         }
-        t1 = match &t1.clone().borrow().parent {
+        t1 = match &t1.clone().lock().borrow().parent {
             Some(o) => o.clone(),
             None => break,
         };
-        t2 = match &t2.clone().borrow().parent {
+        t2 = match &t2.clone().lock().borrow().parent {
             Some(o) => o.clone(),
             None => break,
         };
-        if std::ptr::eq(&*t1.borrow(), &*t2.borrow()) {
+        if std::ptr::eq(&*t1.lock().borrow(), &*t2.lock().borrow()) {
             t3 = Some(t2.clone());
             break;
         }
     }
     match t3 {
-        Some(o) => o.borrow_mut().parent = None,
+        Some(o) => o.lock().borrow_mut().parent = None,
         None => (),
     }
 }
@@ -166,7 +187,7 @@ mod tests {
 
     #[test]
     fn exec_recursion_test() {
-        let p1 = Rc::new(RefCell::new(Password::new(
+        let p1 = Password::from_password(Password::new(
             None,
             "p1".to_string(),
             None,
@@ -174,13 +195,15 @@ mod tests {
             99,
             Date::new(2022, 12, 3),
             None,
-        )));
+        ));
 
-        p1.borrow_mut().parent = Some(p1.clone());
+        {
+            p1.lock().borrow_mut().parent = Some(p1.clone());
+        };
         fix_password_recursion(p1.clone());
-        assert_eq!(p1.borrow().parent, None);
+        assert_eq!(p1.lock().borrow().parent.is_none(), true);
 
-        let p2 = Rc::new(RefCell::new(Password::new(
+        let p2 = Password::from_password(Password::new(
             None,
             "p2".to_string(),
             None,
@@ -188,9 +211,9 @@ mod tests {
             99,
             Date::new(2022, 12, 3),
             None,
-        )));
-        p2.borrow_mut().parent = Some(p1.clone());
-        let p3 = Rc::new(RefCell::new(Password::new(
+        ));
+        p2.lock().borrow_mut().parent = Some(p1.clone());
+        let p3 = Password::from_password(Password::new(
             None,
             "p3".to_string(),
             None,
@@ -198,9 +221,9 @@ mod tests {
             99,
             Date::new(2022, 12, 3),
             None,
-        )));
-        p3.borrow_mut().parent = Some(p2.clone());
-        let p4 = Rc::new(RefCell::new(Password::new(
+        ));
+        p3.lock().borrow_mut().parent = Some(p2.clone());
+        let p4 = Password::from_password(Password::new(
             None,
             "p4".to_string(),
             None,
@@ -208,9 +231,9 @@ mod tests {
             99,
             Date::new(2022, 12, 3),
             None,
-        )));
-        p4.borrow_mut().parent = Some(p3.clone());
-        let p5 = Rc::new(RefCell::new(Password::new(
+        ));
+        p4.lock().borrow_mut().parent = Some(p3.clone());
+        let p5 = Password::from_password(Password::new(
             None,
             "p5".to_string(),
             None,
@@ -218,12 +241,12 @@ mod tests {
             99,
             Date::new(2022, 12, 3),
             None,
-        )));
-        p5.borrow_mut().parent = Some(p4.clone());
+        ));
+        p5.lock().borrow_mut().parent = Some(p4.clone());
 
-        p1.borrow_mut().parent = Some(p3.clone());
+        p1.lock().borrow_mut().parent = Some(p3.clone());
         fix_password_recursion(p5.clone());
-        assert_eq!(p3.borrow().parent, None);
+        assert_eq!(p3.lock().borrow().parent.is_none(), true);
     }
 
     #[test]
diff --git a/hel/src/repl.rs b/hel/src/repl.rs
index b23acbc..399a872 100644
--- a/hel/src/repl.rs
+++ b/hel/src/repl.rs
@@ -1,15 +1,13 @@
-use std::{cell::RefCell, rc::Rc};
-
-use crate::lk::LK;
+use crate::lk::LKRef;
 use crate::parser::command_parser;
 use crate::structs::{Command, LKErr, LKOut, HISTORY_FILE};
-use crate::utils::editor::{ Editor, password };
+use crate::utils::editor::{password, Editor};
 
 #[derive(Debug)]
 pub struct LKRead {
     pub rl: Editor,
     pub prompt: String,
-    pub state: Rc<RefCell<LK>>,
+    pub state: LKRef,
     pub cmd: String,
     pub read_password: fn(String) -> std::io::Result<String>,
 }
@@ -17,19 +15,19 @@ pub struct LKRead {
 #[derive(Debug)]
 pub struct LKEval<'a> {
     pub cmd: Command<'a>,
-    pub state: Rc<RefCell<LK>>,
+    pub state: LKRef,
     pub read_password: fn(String) -> std::io::Result<String>,
 }
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug)]
 pub struct LKPrint {
     pub out: LKOut,
     pub quit: bool,
-    pub state: Rc<RefCell<LK>>,
+    pub state: LKRef,
 }
 
 impl LKRead {
-    pub fn new(rl: Editor, prompt: String, state: Rc<RefCell<LK>>) -> Self {
+    pub fn new(rl: Editor, prompt: String, state: LKRef) -> Self {
         Self {
             rl,
             prompt,
@@ -77,7 +75,7 @@ impl LKRead {
 }
 
 impl<'a> LKEval<'a> {
-    pub fn new(cmd: Command<'a>, state: Rc<RefCell<LK>>, read_password: fn(String) -> std::io::Result<String>) -> Self {
+    pub fn new(cmd: Command<'a>, state: LKRef, read_password: fn(String) -> std::io::Result<String>) -> Self {
         Self {
             cmd,
             state,
@@ -94,25 +92,33 @@ impl<'a> LKEval<'a> {
                 out.e("Bye!".to_string());
                 quit = true;
             }
-            Command::Ls(filter) => self.cmd_ls(&out, filter.to_string(), |a,b| a.borrow().name.cmp(&b.borrow().name)),
-            Command::Ld(filter) => self.cmd_ls(&out, filter.to_string(), |a,b| a.borrow().date.cmp(&b.borrow().date)),
+            Command::Ls(filter) => {
+                self.cmd_ls(&out, filter.to_string(), |a, b| a.lock().borrow().name.cmp(&b.lock().borrow().name))
+            }
+            Command::Ld(filter) => {
+                self.cmd_ls(&out, filter.to_string(), |a, b| a.lock().borrow().date.cmp(&b.lock().borrow().date))
+            }
             Command::Add(name) => self.cmd_add(&out, &name),
             Command::Leave(name) => self.cmd_leave(&out, &name),
             Command::Comment(name, comment) => self.cmd_comment(&out, &name, &comment),
             Command::Rm(name) => match self.get_password(name) {
                 Some(pwd) => {
-                    self.state.borrow_mut().db.remove(&pwd.borrow().name);
-                    out.o(format!("removed {}", pwd.borrow().name));
+                    self.state.lock().borrow_mut().db.remove(&pwd.lock().borrow().name);
+                    out.o(format!("removed {}", pwd.lock().borrow().name));
                 }
                 None => out.e(format!("error: password {} not found", name)),
             },
-            Command::Enc(name) => { self.cmd_enc(&out, name); }
+            Command::Enc(name) => {
+                self.cmd_enc(&out, name);
+            }
             Command::Gen(num, name) => self.cmd_gen(&out, &num, &name),
             Command::PasteBuffer(command) => self.cmd_pb(&out, command),
-            Command::Source(script) => { quit = self.cmd_source(&out, script); }
+            Command::Source(script) => {
+                quit = self.cmd_source(&out, script);
+            }
             Command::Dump(script) => self.cmd_dump(&out, script),
             Command::Pass(name) => self.cmd_pass(&out, &name),
-            Command::UnPass(name) => match self.state.borrow_mut().secrets.remove(name) {
+            Command::UnPass(name) => match self.state.lock().borrow_mut().secrets.remove(name) {
                 Some(_) => out.o(format!("Removed saved password for {}", name)),
                 None => out.e(format!("error: saved password for {} not found", name)),
             },
@@ -136,7 +142,7 @@ impl<'a> LKEval<'a> {
 }
 
 impl LKPrint {
-    pub fn new(out: LKOut, quit: bool, state: Rc<RefCell<LK>>) -> Self {
+    pub fn new(out: LKOut, quit: bool, state: LKRef) -> Self {
         Self { out, quit, state }
     }
 
@@ -147,16 +153,26 @@ impl LKPrint {
     }
 }
 
+impl PartialEq for LKPrint {
+    fn eq(&self, other: &Self) -> bool {
+        self.out == other.out && self.quit == other.quit && *self.state.lock() == *other.state.lock()
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::lk::LK;
     use crate::password::Password;
     use crate::structs::Mode;
-    use std::collections::HashMap;
     use crate::utils::date::Date;
+    use parking_lot::ReentrantMutex;
+    use std::cell::RefCell;
+    use std::collections::HashMap;
+    use std::sync::Arc;
 
     impl<'a> LKEval<'a> {
-        pub fn news(cmd: Command<'a>, state: Rc<RefCell<LK>>) -> Self {
+        pub fn news(cmd: Command<'a>, state: LKRef) -> Self {
             Self {
                 cmd,
                 state,
@@ -169,12 +185,12 @@ mod tests {
 
     #[test]
     fn exec_cmds_basic() {
-        let lk = Rc::new(RefCell::new(LK::new()));
+        let lk = Arc::new(ReentrantMutex::new(RefCell::new(LK::new())));
         assert_eq!(
             LKEval::news(Command::Ls(".".to_string()), lk.clone()).eval(),
             LKPrint::new(LKOut::from_vecs(vec![], vec![]), false, lk.clone())
         );
-        let pwd1 = Rc::new(RefCell::new(Password {
+        let pwd1 = Password::from_password(Password {
             name: "t1".to_string(),
             prefix: None,
             length: None,
@@ -183,12 +199,25 @@ mod tests {
             date: Date::new(2022, 12, 30),
             comment: Some("comment".to_string()),
             parent: None,
-        }));
-        assert_eq!(LKEval::news(Command::Add(pwd1.clone()), lk.clone()).eval().state.borrow().db, {
-            let mut db = HashMap::new();
-            db.insert(pwd1.borrow().name.to_string(), pwd1.clone());
-            db
         });
+        assert_eq!(
+            LKEval::news(Command::Add(pwd1.clone()), lk.clone())
+                .eval()
+                .state
+                .lock()
+                .borrow()
+                .db
+                .iter()
+                .map(|x| (x.0.to_string(), x.1.lock().borrow().to_string()))
+                .collect::<Vec<(String, String)>>(),
+            {
+                let mut db = HashMap::new();
+                db.insert(pwd1.lock().borrow().name.to_string(), pwd1.clone());
+                db.into_iter()
+                    .map(|x| (x.0.to_string(), x.1.lock().borrow().to_string()))
+                    .collect::<Vec<(String, String)>>()
+            }
+        );
         assert_eq!(
             LKEval::news(Command::Ls(".".to_string()), lk.clone()).eval(),
             LKPrint::new(
@@ -201,7 +230,7 @@ mod tests {
             LKEval::news(Command::Quit, lk.clone()).eval(),
             LKPrint::new(LKOut::from_vecs(vec![], vec!["Bye!".to_string()]), true, lk.clone())
         );
-        let pwd2 = Rc::new(RefCell::new(Password {
+        let pwd2 = Password::from_password(Password {
             name: "t2".to_string(),
             prefix: None,
             length: None,
@@ -210,18 +239,32 @@ mod tests {
             date: Date::new(2022, 12, 31),
             comment: Some("bli blup".to_string()),
             parent: None,
-        }));
-        assert_eq!(LKEval::news(Command::Add(pwd2.clone()), lk.clone()).eval().state.borrow().db, {
-            let mut db = HashMap::new();
-            db.insert(pwd1.borrow().name.to_string(), pwd1.clone());
-            db.insert(pwd2.borrow().name.to_string(), pwd2.clone());
-            db
         });
+        assert_eq!(
+            LKEval::news(Command::Add(pwd2.clone()), lk.clone())
+                .eval()
+                .state
+                .lock()
+                .borrow()
+                .db
+                .iter()
+                .map(|x| (x.0.to_string(), x.1.lock().borrow().to_string()))
+                .collect::<Vec<(String, String)>>(),
+            {
+                let mut db = HashMap::new();
+                db.insert(pwd1.lock().borrow().name.to_string(), pwd1.clone());
+                db.insert(pwd2.lock().borrow().name.to_string(), pwd2.clone());
+                db.into_iter().map(|x| (x.0, x.1.lock().borrow().to_string())).collect::<Vec<(String, String)>>()
+            }
+        );
         assert_eq!(
             LKEval::news(Command::Ls(".".to_string()), lk.clone()).eval(),
             LKPrint::new(
                 LKOut::from_vecs(
-                    vec!["  1       t1 R 99 2022-12-30 comment".to_string(), "  2       t2 R 99 2022-12-31 bli blup".to_string()],
+                    vec![
+                        "  1       t1 R 99 2022-12-30 comment".to_string(),
+                        "  2       t2 R 99 2022-12-31 bli blup".to_string()
+                    ],
                     vec![]
                 ),
                 false,
@@ -244,8 +287,8 @@ mod tests {
 
     #[test]
     fn read_pwd_test() {
-        let lk = Rc::new(RefCell::new(LK::new()));
-        let t1 = Rc::new(RefCell::new(Password::new(
+        let lk = Arc::new(ReentrantMutex::new(RefCell::new(LK::new())));
+        let t1 = Password::from_password(Password::new(
             None,
             "t1".to_string(),
             None,
@@ -253,8 +296,8 @@ mod tests {
             99,
             Date::new(2022, 12, 30),
             None,
-        )));
-        let t2 = Rc::new(RefCell::new(Password::new(
+        ));
+        let t2 = Password::from_password(Password::new(
             None,
             "t2".to_string(),
             None,
@@ -262,8 +305,8 @@ mod tests {
             99,
             Date::new(2022, 12, 30),
             None,
-        )));
-        let t3 = Rc::new(RefCell::new(Password::new(
+        ));
+        let t3 = Password::from_password(Password::new(
             None,
             "t3".to_string(),
             None,
@@ -271,19 +314,23 @@ mod tests {
             99,
             Date::new(2022, 12, 30),
             None,
-        )));
+        ));
+        println!("POINT 1");
         assert_eq!(
             LKEval::news(Command::Add(t1.clone()), lk.clone()).eval(),
             LKPrint::new(LKOut::from_vecs(vec![], vec![]), false, lk.clone())
         );
+        println!("POINT 2");
         assert_eq!(
             LKEval::news(Command::Add(t2.clone()), lk.clone()).eval(),
             LKPrint::new(LKOut::from_vecs(vec![], vec![]), false, lk.clone())
         );
+        println!("POINT 3");
         assert_eq!(
             LKEval::news(Command::Add(t3.clone()), lk.clone()).eval(),
             LKPrint::new(LKOut::from_vecs(vec![], vec![]), false, lk.clone())
         );
+        println!("POINT 4");
         assert_eq!(
             LKEval::news(Command::Mv("t3".to_string(), "t2".to_string()), lk.clone()).eval(),
             LKPrint::new(LKOut::from_vecs(vec![], vec![]), false, lk.clone())
diff --git a/hel/src/structs.rs b/hel/src/structs.rs
index b6cbfc0..1ea56d7 100644
--- a/hel/src/structs.rs
+++ b/hel/src/structs.rs
@@ -1,13 +1,16 @@
 use crate::password::{Comment, Name, PasswordRef};
+use parking_lot::Mutex;
+use parking_lot::ReentrantMutex;
+use std::cell::RefCell;
 use std::fmt;
 use std::path::Path;
-use std::{cell::RefCell, rc::Rc};
+use std::sync::Arc;
 
 use crate::lk::LK;
 use crate::parser::command_parser;
 use crate::repl::{LKEval, LKRead};
+use crate::utils::editor::{password, Editor};
 use crate::utils::home;
-use crate::utils::editor::{ Editor, password };
 
 lazy_static! {
     pub static ref HISTORY_FILE: Box<Path> = {
@@ -54,7 +57,7 @@ pub enum LKErr<'a> {
     ParseError(peg::error::ParseError<peg::str::LineCol>),
 }
 
-#[derive(PartialEq, Debug)]
+#[derive(Debug)]
 pub enum Command<'a> {
     Add(PasswordRef),
     Leave(Name),
@@ -78,6 +81,34 @@ pub enum Command<'a> {
     Quit,
 }
 
+impl<'a> PartialEq for Command<'a> {
+    fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (Command::Add(s), Command::Add(o)) => *s.lock() == *o.lock(),
+            (Command::Leave(s), Command::Leave(o)) => s == o,
+            (Command::Ls(s), Command::Ls(o)) => s == o,
+            (Command::Ld(s), Command::Ld(o)) => s == o,
+            (Command::Mv(a, b), Command::Mv(x, y)) => a == x && b == y,
+            (Command::Rm(s), Command::Rm(o)) => s == o,
+            (Command::Enc(s), Command::Enc(o)) => s == o,
+            (Command::Gen(a, b), Command::Gen(x, y)) => a == x && *b.lock() == *y.lock(),
+            (Command::Pass(s), Command::Pass(o)) => s == o,
+            (Command::UnPass(s), Command::UnPass(o)) => s == o,
+            (Command::Correct(s), Command::Correct(o)) => s == o,
+            (Command::Uncorrect(s), Command::Uncorrect(o)) => s == o,
+            (Command::PasteBuffer(s), Command::PasteBuffer(o)) => s == o,
+            (Command::Source(s), Command::Source(o)) => s == o,
+            (Command::Dump(s), Command::Dump(o)) => s == o,
+            (Command::Comment(a, b), Command::Comment(x, y)) => a == x && b == y,
+            (Command::Error(s), Command::Error(o)) => s == o,
+            (Command::Noop, Command::Noop) => true,
+            (Command::Help, Command::Help) => true,
+            (Command::Quit, Command::Quit) => true,
+            _ => false,
+        }
+    }
+}
+
 #[derive(PartialEq, Debug, Clone)]
 pub enum Mode {
     Regular,
@@ -114,21 +145,21 @@ impl std::fmt::Display for Mode {
     }
 }
 
-#[derive(PartialEq, Debug)]
+#[derive(Debug)]
 pub struct LKOut {
-    pub out: Option<Rc<RefCell<Vec<String>>>>,
-    pub err: Option<Rc<RefCell<Vec<String>>>>,
+    pub out: Option<Arc<Mutex<Vec<String>>>>,
+    pub err: Option<Arc<Mutex<Vec<String>>>>,
 }
 
 impl LKOut {
     pub fn new() -> Self {
         Self {
-            out: Some(Rc::new(RefCell::new(vec![]))),
-            err: Some(Rc::new(RefCell::new(vec![]))),
+            out: Some(Arc::new(Mutex::new(vec![]))),
+            err: Some(Arc::new(Mutex::new(vec![]))),
         }
     }
 
-    pub fn from_lkout(out: Option<Rc<RefCell<Vec<String>>>>, err: Option<Rc<RefCell<Vec<String>>>>) -> Self {
+    pub fn from_lkout(out: Option<Arc<Mutex<Vec<String>>>>, err: Option<Arc<Mutex<Vec<String>>>>) -> Self {
         let o = match out {
             Some(v) => Some(v.clone()),
             None => None,
@@ -143,8 +174,8 @@ impl LKOut {
     #[allow(dead_code)]
     pub fn from_vecs(out: Vec<String>, err: Vec<String>) -> Self {
         Self {
-            out: Some(Rc::new(RefCell::new(out))),
-            err: Some(Rc::new(RefCell::new(err))),
+            out: Some(Arc::new(Mutex::new(out))),
+            err: Some(Arc::new(Mutex::new(err))),
         }
     }
 
@@ -152,7 +183,7 @@ impl LKOut {
         if !self.out.is_some() {
             return;
         }
-        for line in self.out.as_ref().unwrap().borrow().iter() {
+        for line in self.out.as_ref().unwrap().lock().iter() {
             out.o(line.to_string())
         }
     }
@@ -161,7 +192,7 @@ impl LKOut {
         if !self.err.is_some() {
             return;
         }
-        for line in self.err.as_ref().unwrap().borrow().iter() {
+        for line in self.err.as_ref().unwrap().lock().iter() {
             out.e(line.to_string())
         }
     }
@@ -170,7 +201,7 @@ impl LKOut {
         if !self.out.is_some() {
             return;
         }
-        for line in self.out.as_ref().unwrap().borrow().iter() {
+        for line in self.out.as_ref().unwrap().lock().iter() {
             println!("{}", line);
         }
     }
@@ -179,7 +210,7 @@ impl LKOut {
         if !self.err.is_some() {
             return;
         }
-        for line in self.err.as_ref().unwrap().borrow().iter() {
+        for line in self.err.as_ref().unwrap().lock().iter() {
             eprintln!("{}", line);
         }
     }
@@ -191,7 +222,7 @@ impl LKOut {
 
     pub fn data(&self) -> String {
         if self.out.is_some() {
-            self.out.as_ref().unwrap().borrow().join("\n")
+            self.out.as_ref().unwrap().lock().join("\n")
         } else {
             "".to_string()
         }
@@ -202,16 +233,30 @@ impl LKOut {
     }
     pub fn o(&self, line: String) {
         if self.out.is_some() {
-            self.out.as_ref().unwrap().borrow_mut().push(line);
+            self.out.as_ref().unwrap().lock().push(line);
         }
     }
     pub fn e(&self, line: String) {
         if self.err.is_some() {
-            self.err.as_ref().unwrap().borrow_mut().push(line);
+            self.err.as_ref().unwrap().lock().push(line);
         }
     }
 }
 
+impl PartialEq for LKOut {
+    fn eq(&self, other: &Self) -> bool {
+        (match (&self.out, &other.out) {
+            (Some(a), Some(b)) => *a.lock() == *b.lock(),
+            (None, None) => true,
+            _ => false,
+        } && match (&self.err, &other.err) {
+            (Some(a), Some(b)) => *a.lock() == *b.lock(),
+            (None, None) => true,
+            _ => false,
+        })
+    }
+}
+
 pub struct Radix {
     x: i32,
     radix: u32,
@@ -263,13 +308,15 @@ impl fmt::Display for Radix {
 }
 
 pub fn init() -> Option<LKRead> {
-    let lk = Rc::new(RefCell::new(LK::new()));
+    let lk = Arc::new(ReentrantMutex::new(RefCell::new(LK::new())));
 
     match std::fs::read_to_string(INIT_FILE.to_str().unwrap()) {
         Ok(script) => match command_parser::script(&script) {
             Ok(cmd_list) => {
                 for cmd in cmd_list {
-                    if !LKEval::new(cmd, lk.clone(), password).eval().print() { return None; }
+                    if !LKEval::new(cmd, lk.clone(), password).eval().print() {
+                        return None;
+                    }
                 }
             }
             Err(err) => {
@@ -349,9 +396,9 @@ mod tests {
 
         let lkread = init().unwrap();
         assert_eq!(lkread.prompt, "test> ");
-        assert_eq!(lkread.state.borrow().db.contains_key("t1"), true);
+        assert_eq!(lkread.state.lock().borrow().db.contains_key("t1"), true);
 
-        let t1 = Rc::new(RefCell::new(Password::new(
+        let t1 = Password::from_password(Password::new(
             None,
             "t1".to_string(),
             None,
@@ -359,8 +406,8 @@ mod tests {
             99,
             Date::new(2022, 10, 10),
             None,
-        )));
-        let t2 = Rc::new(RefCell::new(Password::new(
+        ));
+        let t2 = Password::from_password(Password::new(
             None,
             "t2".to_string(),
             None,
@@ -368,9 +415,9 @@ mod tests {
             99,
             Date::new(2022, 10, 10),
             Some("test".to_string()),
-        )));
-        t2.borrow_mut().parent = Some(t1.clone());
-        let t3 = Rc::new(RefCell::new(Password::new(
+        ));
+        t2.lock().borrow_mut().parent = Some(t1.clone());
+        let t3 = Password::from_password(Password::new(
             None,
             "t3".to_string(),
             None,
@@ -378,15 +425,13 @@ mod tests {
             99,
             Date::new(2022, 10, 10),
             Some("aoeu".to_string()),
-        )));
-        t3.borrow_mut().parent = Some(t2.clone());
-        assert_eq!(*lkread.state.borrow().db.get("t1").unwrap().borrow(), *t1.borrow());
-        assert_eq!(*lkread.state.borrow().db.get("t2").unwrap().borrow(), *t2.borrow());
-        assert_eq!(*lkread.state.borrow().db.get("t3").unwrap().borrow(), *t3.borrow());
+        ));
+        t3.lock().borrow_mut().parent = Some(t2.clone());
+        assert_eq!(*lkread.state.lock().borrow().db.get("t1").unwrap().lock(), *t1.lock());
+        assert_eq!(*lkread.state.lock().borrow().db.get("t2").unwrap().lock(), *t2.lock());
+        assert_eq!(*lkread.state.lock().borrow().db.get("t3").unwrap().lock(), *t3.lock());
 
-        LKEval::new(command_parser::cmd("save").unwrap(), lkread.state.clone(), password)
-            .eval()
-            .print();
+        LKEval::new(command_parser::cmd("save").unwrap(), lkread.state.clone(), password).eval().print();
         assert_eq!(
             std::fs::read_to_string("test_dump").expect("read"),
             "add       t1 R 99 2022-10-10\nadd       t2 R 99 2022-10-10 test ^t1\nadd       t3 R 99 2022-10-10 aoeu ^t2\n".to_string()
@@ -412,7 +457,7 @@ mod tests {
                 ]
             )
         );
-        lkread.state.borrow_mut().secrets.clear();
+        lkread.state.lock().borrow_mut().secrets.clear();
         let pr = LKEval::new(command_parser::cmd("pb enc t3").unwrap(), lkread.state.clone(), |v| {
             if v == "/" {
                 Ok("a".to_string())
diff --git a/hel/src/utils.rs b/hel/src/utils.rs
index 144382c..6a32349 100644
--- a/hel/src/utils.rs
+++ b/hel/src/utils.rs
@@ -11,12 +11,14 @@ pub mod date {
 
     #[derive(PartialEq, Debug, Clone, Copy)]
     pub struct Date {
-        date: NaiveDate
+        date: NaiveDate,
     }
 
     impl Date {
         pub fn new(year: i32, month: u32, day: u32) -> Self {
-            Self { date: NaiveDate::from_ymd_opt(year, month, day).unwrap() }
+            Self {
+                date: NaiveDate::from_ymd_opt(year, month, day).unwrap(),
+            }
         }
 
         pub fn try_new(year: i32, month: u32, day: u32) -> Result<Self, &'static str> {
@@ -27,7 +29,9 @@ pub mod date {
         }
 
         pub fn now() -> Self {
-            Self { date: Local::now().naive_local().date() }
+            Self {
+                date: Local::now().naive_local().date(),
+            }
         }
 
         pub fn cmp(&self, other: &Self) -> core::cmp::Ordering {
@@ -95,7 +99,9 @@ pub mod editor {
 
     impl Editor {
         pub fn new() -> Self {
-            Self { editor: rustyline::Editor::<()>::new().unwrap() }
+            Self {
+                editor: rustyline::Editor::<()>::new().unwrap(),
+            }
         }
 
         pub fn clear_history(&mut self) {
diff --git a/helwasm/Cargo.toml b/helwasm/Cargo.toml
index 67b19fd..50dbe43 100644
--- a/helwasm/Cargo.toml
+++ b/helwasm/Cargo.toml
@@ -13,6 +13,7 @@ crate-type = ["cdylib"]
 
 [dependencies]
 hel = { version = "0.1.0", path = "../hel" }
+lazy_static = "1.4.0"
 wasm-bindgen = "0.2.83"
 
 [dependencies.web-sys]
diff --git a/helwasm/index.html b/helwasm/index.html
index 2e46921..5073fde 100644
--- a/helwasm/index.html
+++ b/helwasm/index.html
@@ -1,7 +1,6 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <script type="module" src="./pkg/helwasm.js"></script>
     <script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script>
     <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script>
     <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
@@ -76,7 +75,9 @@
   </head>
   <body>
     <div id="root"></div>
-    <script type="text/javascript">
+    <script type="module">
+      import init, { ok_add } from "./pkg/helwasm.js";
+
       function read_line(prompt) {
         console.log("called read_line: " + prompt);
         return "line";
@@ -87,6 +88,11 @@
         return "password";
       }
 
+      init().then(() => {
+        window.hel = {
+          ok_add: ok_add,
+        }
+      });
     </script>
     <script type="text/babel">
       function Terminal() {
diff --git a/helwasm/src/hel_state.rs b/helwasm/src/hel_state.rs
new file mode 100644
index 0000000..7c38924
--- /dev/null
+++ b/helwasm/src/hel_state.rs
@@ -0,0 +1,6 @@
+use hel::lk::LK;
+use std::sync::{Arc, Mutex};
+
+lazy_static! {
+    static ref STATE: Arc<Mutex<LK>> = Arc::new(Mutex::new(LK::new()));
+}
diff --git a/helwasm/src/lib.rs b/helwasm/src/lib.rs
index 08aad3a..92e3d7d 100644
--- a/helwasm/src/lib.rs
+++ b/helwasm/src/lib.rs
@@ -1,3 +1,5 @@
+#[macro_use]
+extern crate lazy_static;
 extern crate hel;
 
 use wasm_bindgen::prelude::*;
@@ -6,3 +8,9 @@ use wasm_bindgen::prelude::*;
 pub fn ok_add(a: i32, b: i32) -> i32 {
     a + b + 1
 }
+
+mod hel_state;
+
+#[wasm_bindgen]
+pub fn hel_init() {
+}