Personally I use SignalR for realtime communication between GWT clients.
SignalR is from Microsoft to let different clients (also desktop .NET
version from within GWT and it works no problem.
We use this technology since our entire backend is already in .NET.
You could also use stuff like WebSockets (which is used internally by
SignalR, but SignalR auto falls back on long polling). Maybe your best
place to start looking is https://github.com/sksamuel/gwt-websockets
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