Feature Request - Push messaging

In a use case where you have a single app and many users using the same app instance, you want that when a user changes some data, all the other users see the change.

I was looking through the code and example to try and see how to do this. I am not sure if the code has this already in it.

i assume that we need a message pump and push based messaging to the client. So its web sockets or whatever, but a decent test could even just represent each users instance as a folder perhaps. This would also allow the test case to run on CI.

Any ideas ?