[android-developers] Android Push c2dm without a server

Is there a way to implement a device 2 device notification system, by
using the c2dm api, but without a third party server for the
registration_id?
I cannot see how a device can know about the existence of another
device, or send directly a notification without implementing a third
party server.
But by required such server, in increases app maintenance, and of
course to make sure the server is alive during all the time you wish
to keep the app in the android market.

Is there any other API which would allow at least a single ping from
device to device?

Thanks

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