This is a real headache. You can either send all the messages (and info/queries) to all logged-in devices, or you select just the most recently used. In the fir

This is a real headache. You can either send all the messages (and info/queries) to all logged-in devices, or you select just the most recently used. In the first case, the user gets messages repeated. In the latter, there's the risk that information is lost when a user switches device.