passing variable from app to window

hello i m trying to pass a variable that exists inside app.js ev.deviceToken to another window window.js i have tryed to do this with setString - getString , but it doesnt works:

Ti.App.Properties.setString('devicetoken', ev.deviceToken); in app.js
Ti.App.Properties.getString('devicetoken'); in my window.js

Now i am trying to pass it with a fireEvent - addEventListener

Ti.App.fireEvent('MyEventString',{devicetoken:ev.deviceToken}); in app.js
Ti.App.addEventListener('MyEventString',function(e){
     dtok = e.devicetoken;
 
});
in my window.js
 
now i want to take this dtok and use it in another addEventListener on this window.js
 
Ti.App.addEventListener("app:got.location", function(d) {
 
webViewHome.setUrl( ................. +dtok