diff --git a/spikes/stacks/redux-thunk/src/client/actions.js b/spikes/stacks/redux-thunk/src/client/actions.js
index c25f3629..b870d56a 100644
--- a/spikes/stacks/redux-thunk/src/client/actions.js
+++ b/spikes/stacks/redux-thunk/src/client/actions.js
@@ -1,4 +1,5 @@
 module.exports = {
+  ...require('./reducers/app').actions,
   ...require('./reducers/printers').actions,
   ...require('./reducers/changes').actions
 };
diff --git a/spikes/stacks/redux-thunk/src/client/api.js b/spikes/stacks/redux-thunk/src/client/api.js
index 1714d755..6f8e6afc 100644
--- a/spikes/stacks/redux-thunk/src/client/api.js
+++ b/spikes/stacks/redux-thunk/src/client/api.js
@@ -24,3 +24,26 @@ exports.fetchChanges = () => {
     return data.changes;
   });
 };
+
+exports.removeChange = (id) => {
+  console.log(`
+  mutation {
+    removeChange(id: "${id}")
+  }
+`);
+  return fetch(`
+    mutation {
+      removeChange(id: "${id}") {
+        id
+      }
+    }
+  `).then(({
+    errors
+  }) => {
+    if (!errors) {
+      return;
+    }
+
+    throw new Error(errors[0].message);
+  });
+};
diff --git a/spikes/stacks/redux-thunk/src/client/components/printers.js b/spikes/stacks/redux-thunk/src/client/components/printers.js
index 1e8f4209..c5e71317 100644
--- a/spikes/stacks/redux-thunk/src/client/components/printers.js
+++ b/spikes/stacks/redux-thunk/src/client/components/printers.js
@@ -2,6 +2,7 @@ const React = require('react');
 
 module.exports = ({
   printers = [],
+  locked = '',
   onClick
 }) => {
   const _onClick = (id) => {
@@ -12,11 +13,20 @@ module.exports = ({
 
   const lis = printers.map(({
     name,
+    lock,
     id
   }) => {
+    const msg = (() => {
+      if (!lock) {
+        return '';
+      }
+
+      return (locked === id) ? '(Locked to you)' : `(Locked to ${lock})`;
+    })();
+
     return (
       <li key={id}>
-        <a onClick={_onClick(id)}>{name}</a>
+        <a onClick={_onClick(id)}>{name} {msg}</a>
       </li>
     );
   });
diff --git a/spikes/stacks/redux-thunk/src/client/containers/app.js b/spikes/stacks/redux-thunk/src/client/containers/app.js
index b00d5e80..eebb35cc 100644
--- a/spikes/stacks/redux-thunk/src/client/containers/app.js
+++ b/spikes/stacks/redux-thunk/src/client/containers/app.js
@@ -1,27 +1,55 @@
 const ReactRedux = require('react-redux');
+const ReactRouter = require('react-router');
 const React = require('react');
 
+const NotFound = require('./not-found');
+const Home = require('./home');
+const Print = require('./print');
+
+const actions = require('../actions');
+
 const {
   connect
 } = ReactRedux;
 
-const App = React.createClass({
+const {
+  Miss,
+  Match
+} = ReactRouter;
+
+const {
+  updateRouter
+} = actions
+
+const App = connect()(React.createClass({
   componentDidMount: function() {
-    require('../worker').on('action', (action) => {
-      this.props.dispatch(action);
-    });
+    require('../worker').on('action', this.props.dispatch);
   },
   render: function() {
     const {
-      children
+      children,
+      router,
+      dispatch
     } = this.props;
 
+    // ugly hack needed because of a limitation of react-router api
+    // that doens't pass it's instance to matched routes
+    dispatch(updateRouter(router));
+
     return (
       <div>
         {children}
       </div>
     );
   }
-});
+}));
 
-module.exports = connect()(App);
+module.exports = (props) => {
+  return (
+    <App {...props}>
+      <Match exactly pattern='/' component={Home} />
+      <Match pattern='/print' component={Print} />
+      <Miss component={NotFound}/>
+    </App>
+  );
+};
diff --git a/spikes/stacks/redux-thunk/src/client/containers/print.js b/spikes/stacks/redux-thunk/src/client/containers/print.js
index 9f3d9686..e226d38e 100644
--- a/spikes/stacks/redux-thunk/src/client/containers/print.js
+++ b/spikes/stacks/redux-thunk/src/client/containers/print.js
@@ -11,13 +11,17 @@ const Change = require('../components/change');
 const actions = require('../actions');
 
 const {
-  fetchChanges
+  fetchChanges,
+  lockPrinter,
+  print,
+  transitionTo
 } = actions;
 
 const {
   BrowserRouter,
   Miss,
   Match,
+  Router
 } = ReactRouter;
 
 const {
@@ -30,8 +34,11 @@ const Print = ({
   changes = [],
   lockPrinter,
   fetchChanges,
+  onPrint,
   loaded,
-  loading
+  loading,
+  locked,
+  router
 }) => {
   const allChanges = () => {
     return (
@@ -58,6 +65,18 @@ const Print = ({
       return change.id === params.id;
     });
 
+    if (!change) {
+      return (
+        <p>Change not found</p>
+      );
+    }
+
+    const _onPrint = (id) => {
+      return () => {
+        return onPrint(id);
+      };
+    };
+
     // TODO: don't load all changes
     return (
       <div>
@@ -69,6 +88,7 @@ const Print = ({
         >
           <Change {...change} />
         </Loader>
+        <button onClick={_onPrint(params.id)}>Print</button>
       </div>
     );
   };
@@ -79,6 +99,8 @@ const Print = ({
         <p>Printers</p>
         <Printers
           printers={printers}
+          onClick={lockPrinter}
+          locked={locked}
         />
       </div>
 
@@ -93,17 +115,25 @@ const mapStateToProps = (state) => {
     loaded: state.ui.changes.loaded,
     loading: state.ui.changes.loading,
     changes: state.data.changes,
-    printers: state.data.printers
+    printers: state.data.printers,
+    locked: state.ui.printers.locked
   };
 };
 
 const mapDispatchToProps = (dispatch) => {
   return {
-    lockPrinter: (id) => {},
+    lockPrinter: (id) => {
+      return dispatch(lockPrinter(id));
+    },
     fetchChanges: () => {
-      dispatch(fetchChanges());
+      return dispatch(fetchChanges());
+    },
+    onPrint: (id) => {
+      return dispatch(print(id)).then(() => {
+        return dispatch(transitionTo('/print'));
+      });
     }
   };
 };
 
-module.exports = connect(mapStateToProps, mapDispatchToProps)(Print);
+module.exports = connect(mapStateToProps, mapDispatchToProps, )(Print);
diff --git a/spikes/stacks/redux-thunk/src/client/intl.json b/spikes/stacks/redux-thunk/src/client/intl.json
new file mode 100644
index 00000000..077404aa
--- /dev/null
+++ b/spikes/stacks/redux-thunk/src/client/intl.json
@@ -0,0 +1,3 @@
+{
+  
+}
\ No newline at end of file
diff --git a/spikes/stacks/redux-thunk/src/client/reducers/app.js b/spikes/stacks/redux-thunk/src/client/reducers/app.js
new file mode 100644
index 00000000..afedb378
--- /dev/null
+++ b/spikes/stacks/redux-thunk/src/client/reducers/app.js
@@ -0,0 +1,30 @@
+const ReduxActions = require('redux-actions');
+const app = require('../../../package.json').name;
+
+const {
+  createAction,
+  handleActions
+} = ReduxActions;
+
+const UPDATE_ROUTER = `${app}/changes/UPDATE_ROUTER`;
+
+exports.ui = handleActions({
+  [UPDATE_ROUTER]: (state, action) => {
+    return {
+      ...state,
+      router: action.payload
+    };
+  }
+}, {});
+
+const actions = exports.actions = {
+  updateRouter: (router) => {
+    return {
+      type: UPDATE_ROUTER,
+      payload: router
+    };
+  },
+  transitionTo: (pathname) => (dispatch, getState) => {
+    return getState().ui.app.router.transitionTo(pathname);
+  }
+};
diff --git a/spikes/stacks/redux-thunk/src/client/reducers/changes.js b/spikes/stacks/redux-thunk/src/client/reducers/changes.js
index ab191a59..4e300f29 100644
--- a/spikes/stacks/redux-thunk/src/client/reducers/changes.js
+++ b/spikes/stacks/redux-thunk/src/client/reducers/changes.js
@@ -8,10 +8,12 @@ const {
 } = ReduxActions;
 
 const {
-  fetchChanges
+  fetchChanges,
+  removeChange
 } = api;
 
 const FETCH_CHANGES = `${app}/changes/FETCH_CHANGES`;
+const REMOVE_CHANGE = `${app}/changes/REMOVE_CHANGE`;
 
 exports.data = handleActions({
   [`${FETCH_CHANGES}_FULFILLED`]: (state, action) => {
@@ -46,11 +48,19 @@ exports.ui = handleActions({
   loaded: false
 });
 
-exports.actions = {
+const actions = exports.actions = {
   fetchChanges: () => {
     return {
       type: FETCH_CHANGES,
       payload: fetchChanges()
     };
+  },
+  removeChange: (id) => (dispatch) => {
+    return dispatch({
+      type: REMOVE_CHANGE,
+      payload: removeChange(id)
+    }).then(() => {
+      return dispatch(actions.fetchChanges());
+    });
   }
 };
diff --git a/spikes/stacks/redux-thunk/src/client/reducers/index.js b/spikes/stacks/redux-thunk/src/client/reducers/index.js
index d5565b04..19bc79f9 100644
--- a/spikes/stacks/redux-thunk/src/client/reducers/index.js
+++ b/spikes/stacks/redux-thunk/src/client/reducers/index.js
@@ -1,6 +1,7 @@
 // const reduceReducers = require('reduce-reducers');
 const Redux = require('redux');
 
+const app = require('./app');
 const printers = require('./printers');
 const changes = require('./changes');
 
@@ -15,7 +16,9 @@ module.exports = () => {
       changes: changes.data
     }),
     ui: combineReducers({
-      changes: changes.ui
+      changes: changes.ui,
+      printers: printers.ui,
+      app: app.ui
     })
   });
 };
diff --git a/spikes/stacks/redux-thunk/src/client/reducers/printers.js b/spikes/stacks/redux-thunk/src/client/reducers/printers.js
index d44b332c..4c2b2e68 100644
--- a/spikes/stacks/redux-thunk/src/client/reducers/printers.js
+++ b/spikes/stacks/redux-thunk/src/client/reducers/printers.js
@@ -1,14 +1,23 @@
 const ReduxActions = require('redux-actions');
 const app = require('../../../package.json').name;
 const find = require('lodash.find');
+const changes = require('./changes');
 
 const {
   createAction,
   handleActions
 } = ReduxActions;
 
+const {
+  actions: {
+    removeChange
+  }
+} = changes;
+
 const UPDATE_PRINTERS = `${app}/printers/UPDATE_PRINTERS`;
 const UPDATE_WORKER_ID = `${app}/printers/UPDATE_WORKER_ID`;
+const LOCK_PRINTER = `${app}/printers/LOCK_PRINTER`;
+const PRINT = `${app}/printers/PRINT`;
 
 exports.data = handleActions({
   [UPDATE_PRINTERS]: (state, action) => {
@@ -27,8 +36,7 @@ exports.ui = handleActions({
     const locked = (find(action.payload, (printer) => {
       return (
         printer.lock &&
-        state.locked &&
-        printer.lock === state.locked
+        printer.lock === state.id
       );
     }) || {}).id || '';
 
@@ -42,7 +50,157 @@ exports.ui = handleActions({
   locked: ''
 });
 
-exports.actions = {
-  updatePrinters: createAction(UPDATE_PRINTERS),
-  updateWorkerId: createAction(UPDATE_WORKER_ID)
+// confirm should be an async op,
+// let's mock it that way
+const confirm = (msg) => {
+  return new Promise((resolve, reject) => {
+    resolve(window.confirm(msg));
+  });
+};
+
+// prompt should be an async op,
+// let's mock it that way
+const prompt = (msg) => {
+  return new Promise((resolve, reject) => {
+    resolve(window.prompt(msg));
+  });
+};
+
+// alert should be an async op,
+// let's mock it that way
+const alert = (msg) => {
+  return new Promise((resolve, reject) => {
+    resolve(window.alert(msg));
+  });
+};
+
+const actions = exports.actions = {
+  updatePrinters: createAction(UPDATE_PRINTERS),
+  updateWorkerId: createAction(UPDATE_WORKER_ID),
+  lockPrinter: (id) => (dispatch, getState) => {
+    const {
+      ui,
+      data
+    } = getState();
+
+    const {
+      printers
+    } = data;
+
+    const {
+      printers: {
+        locked
+      }
+    } = ui;
+
+    if (locked === id) {
+      return;
+    }
+
+    const printer = find(printers, ['id', id]);
+
+    if (!printer) {
+      return window.alert(`Printer ${id} not found`);
+    }
+
+    const worker = require('../worker');
+
+    const lock = () => {
+      return dispatch({
+        type: LOCK_PRINTER,
+        payload: worker.dispatch({
+          type: 'LOCK_PRINTER',
+          payload: id
+        })
+      });
+    };
+
+    const askToLock = () => {
+      const msg = `Do you want to lock printer ${id}?`;
+      return confirm(msg).then((yes) => {
+        return yes ? lock(id) : null;
+      });
+    };
+
+    const askToOverride = () => {
+      const msg = `Printer ${id} already locked! Do you want to override?`;
+      return confirm(msg).then((yes) => {
+        return yes ? lock(id) : null;
+      });
+    };
+
+    return printer.lock ? askToOverride() : askToLock();
+  },
+  print: (changeId) => (dispatch, getState) => {
+    const {
+      ui,
+      data
+    } = getState();
+
+    const {
+      printers
+    } = data;
+
+    const {
+      printers: {
+        locked
+      }
+    } = ui;
+
+    const worker = require('../worker');
+
+    const print = () => {
+      return dispatch({
+        type: PRINT,
+        payload: worker.dispatch({
+          type: 'PRINT',
+          payload: changeId
+        })
+      }).then(() => {
+        return dispatch(removeChange(changeId));
+      });
+    };
+
+    const lock = (printerId) => {
+      return dispatch({
+        type: LOCK_PRINTER,
+        payload: worker.dispatch({
+          type: 'LOCK_PRINTER',
+          payload: printerId
+        })
+      }).then(print);
+    };
+
+    const askToOverride = (printerId) => {
+      const msg = `Printer ${printerId} already locked! Do you want to override?`;
+      return confirm(msg).then((yes) => {
+        return yes ? lock(printerId) : null;
+      });
+    };
+
+    const askToLock = () => {
+      const msg = `Please select a printer to lock: ${
+        printers.map(({
+          id,
+          name
+        }) => {
+          return `\n(${id}) ${name}`;
+        })
+      }`;
+
+      return prompt(msg).then((printerId) => {
+        const printer = find(printers, ['id', printerId]);
+
+        if (!printer) {
+          return alert(`Printer ${printerId} not found. Try again`).then(() => {
+            return actions.print(printerId)(dispatch, getState);
+          });
+        }
+
+        return printer.lock ? askToOverride(printerId) : lock(printerId);
+      });
+    };
+
+    return !locked ? askToLock() : print();
+  }
 };
diff --git a/spikes/stacks/redux-thunk/src/client/root.js b/spikes/stacks/redux-thunk/src/client/root.js
index 8fceb79f..9f77b3d9 100644
--- a/spikes/stacks/redux-thunk/src/client/root.js
+++ b/spikes/stacks/redux-thunk/src/client/root.js
@@ -2,11 +2,9 @@ const React = require('react');
 const ReactHotLoader = require('react-hot-loader');
 const ReactRouter = require('react-router');
 const ReactRedux = require('react-redux');
+const ReactIntl = require('react-intl');
 
 const App = require('./containers/app');
-const NotFound = require('./containers/not-found');
-const Home = require('./containers/home');
-const Print = require('./containers/print');
 
 const store = require('./store');
 
@@ -16,25 +14,33 @@ const {
 
 const {
   BrowserRouter,
-  Miss,
-  Match
 } = ReactRouter;
 
 const {
   Provider
 } = ReactRedux;
 
+const {
+  IntlProvider
+} = ReactIntl;
+
+// http://stackoverflow.com/a/38150585
+const locale = (
+  navigator.languages && navigator.languages[0] || // Chrome / Firefox
+  navigator.language ||   // All browsers
+  navigator.userLanguage // IE <= 10
+);
+
 module.exports = () => {
   return (
     <AppContainer>
       <Provider store={store()}>
-        <BrowserRouter>
-          <App>
-            <Match exactly pattern='/' component={Home} />
-            <Match pattern='/print' component={Print} />
-            <Miss component={NotFound}/>
-          </App>
-        </BrowserRouter>
+        <IntlProvider
+          locale={locale}
+          defaultLocale='en'
+        >
+          <BrowserRouter>{App}</BrowserRouter>
+        </IntlProvider>
       </Provider>
     </AppContainer>
   );
diff --git a/spikes/stacks/redux-thunk/src/client/store.js b/spikes/stacks/redux-thunk/src/client/store.js
index a50f4fce..d18102b3 100644
--- a/spikes/stacks/redux-thunk/src/client/store.js
+++ b/spikes/stacks/redux-thunk/src/client/store.js
@@ -18,7 +18,7 @@ module.exports = (state = Object.freeze({})) => {
     state,
     compose(
       applyMiddleware(
-        createLogger(),
+//        createLogger(),
         promiseMiddleware(),
         thunk
       )
diff --git a/spikes/stacks/redux-thunk/src/client/worker.js b/spikes/stacks/redux-thunk/src/client/worker.js
index 3fe1b68d..c3a472a8 100644
--- a/spikes/stacks/redux-thunk/src/client/worker.js
+++ b/spikes/stacks/redux-thunk/src/client/worker.js
@@ -9,12 +9,44 @@ let isMaster = crosstab.util.tabs['MASTER_TAB'].id === crosstab.id;
 const bridge = new Map();
 
 const {
-  updatePrinters
+  updatePrinters,
+  updateWorkerId
 } = actions;
 
+const printers = {
+  '1': {
+    id: '1',
+    name: 'Main printer',
+    lock: ''
+  },
+  '2': {
+    id: '2',
+    name: 'Handled printer',
+    lock: ''
+  }
+};
+
 const handlers = {
-  'PRINT': (action, fn) => {},
+  'PRINT': (action, fn) => {
+    fn();
+  },
   'LOCK_PRINTER': (action, fn) => {
+    const alreadyLocked = values(printers).filter((printer) => {
+      return printer.lock === action._origin;
+    });
+
+    alreadyLocked.forEach((printer) => {
+      printers[printer.id] = {
+        ...printers[printer.id],
+        lock: ''
+      };
+    });
+
+    printers[action.payload] = {
+      ...printers[action.payload],
+      lock: action._origin
+    };
+
     fn();
   }
 };
@@ -46,7 +78,10 @@ crosstab.util.events.on('message', ({
     return emitter.emit('action', data);
   }
 
-  handlers[data.type](data, (err, res) => {
+  handlers[data.type]({
+    ...data,
+    _origin: origin
+  }, (err, res) => {
     crosstab.broadcast('message', {
       ...data,
       error: err && err.message
@@ -66,7 +101,10 @@ const dispatch = module.exports.dispatch = (action, tab) => {
   if (isMaster && !tab) {
     if (handlers[action.type]) {
       return new Promise(function(resolve, reject) {
-        handlers[action.type](action, function(err, res) {
+        handlers[action.type]({
+          ...action,
+          _origin: crosstab.id
+        }, function(err, res) {
           return err ? reject(err) : resolve(res);
         });
       });
@@ -90,20 +128,9 @@ const dispatch = module.exports.dispatch = (action, tab) => {
   return then;
 };
 
-const printers = {
-  '1': {
-    id: '1',
-    name: 'Main printer',
-    lock: ''
-  },
-  '2': {
-    id: '2',
-    name: 'Handled printer',
-    lock: ''
-  }
-};
-
-emitter.emit('action', updateWorkerId(crosstab.id));
+setTimeout(function() {
+  emitter.emit('action', updateWorkerId(crosstab.id));
+}, 450);
 
 setInterval(() => {
   if (!isMaster) {
diff --git a/spikes/stacks/redux-thunk/src/server/schema.js b/spikes/stacks/redux-thunk/src/server/schema.js
index 9e73a578..f9ae591c 100644
--- a/spikes/stacks/redux-thunk/src/server/schema.js
+++ b/spikes/stacks/redux-thunk/src/server/schema.js
@@ -114,7 +114,7 @@ const mutation = new GraphQLObjectType({
         }
       },
       resolve(root, args, ctx) {
-        const changes = (() => {
+        const ops = (() => {
           if (args.id) {
             return [args.id];
           }
@@ -128,7 +128,7 @@ const mutation = new GraphQLObjectType({
           });
         })();
 
-        changes.forEach((id) => {
+        ops.forEach((id) => {
           delete changes[id];
         });
       }