How to start an activity from application in one device to the application in another device

i have a scenario like this:

I am developing an android peer to peer application (using android.net.wifi.p2p) and my application detects another android devices in range and connects to those devices. And should invoke an activity of the same app(my application installed on that device). I know how to start an activity using intents but this time i need to start an activity in another device from my device.

Please guide me through the correct procedure to achieve this.

Thanks in advance.

I just want to know the basic steps to detect application installed on the other phone and invoke it (assuming both devices are connected thought wifi).

There is nothing built into Android for this, for obvious security and privacy reasons.