If two devices operate concurrently the actions of one may affect the others data (Their data depends on each other). If they are able to sync with each other their data could be updated offline before they go back online and sync with the server.
Interesting question. I haven't try such functionality. It should be implemented manually, in all cases. ME/MI doesn't offer such thing.
It is possible of course, to implement everything manually. Peer2peer connectivity is not very hard to implement, the main object is the algorithm for synchronizing, i.e. which drive has the accurate data and which - the oldest one.
I don't know what business processes you want to implement, but you may think about a repository database for offline synchronizing. So you may synchronize more than one device, with simpler protocol: client-database through JDBC.
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