Alloy controllers in alloy.js

I was just wondering. I have all of my controllers being created in alloy.js is this an ideal way to go about swapping through windows?

an example would be as follows

alloy.js

Alloy.globals.myWindow = alloy.createController('myWindow').getView();
Alloy.globals.myNewWindow = alloy.createController('myNewWindow').getView();

Alloy.globals.myWindow.close();
Alloy.globals.myNewWindow.open();