What do you mean for separate modules? Gwt enables to develop separate modules
but during compilation time you will get a unique javascript source... if you
mean that you have more than one entry point I can imagine that you are running
them in separate window or separate iframe. If so you can build an event driven
interface trough Window.postMessage, when a window receives a message you can
intercept it with window.addEventListener('message', listener). More info on
https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage
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