title: communication between 2 browser windows in electron
body: <p>I need to build an app that will span across multiple monitor screens, something like this:
  <a href="https://i.stack.imgur.com/SPSpU.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SPSpU.png" alt="multiple windows on different monitors" /></a>
  Electron supports multiple windows but how do I communicate between them?</p>