How to communicate between controllers of two different modules in AngularJs

Question

I want to know that can we communicate between two different controllers in AngularJS. Suppose I have Two modules,
Plunker: http://plnkr.co/edit/if0MQwlx9WHrD8XnMi2t?p=

Answer 1

your plunker has a very minor issue.

change this

     angular.module('myApp', [])

to

     angular.module('myApp', ['myNewApp'])