- If you want just to send a message to another app, *without expecting *a result, use Intents on one app (and a BroadcastReciever on the other app). - If you want to send a message to another app, while *expecting *a result, but this result could be sent back later (*asynchronously*), use an Intent with a ResultReceiver in one of its 'extras', and use a BroadcastReceiver in the other app that calls 'send' on the received Intent's 'extra' (ResultReceiver) when it needs to send back a result. - If you want to send a message to another app, while expecting a result *synchronously*, you can do the same as the previous point, but you have to write some synchronization code yourself. Or you could use AIDL where the methods you define have a return value.
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