A question about APIs

I am writing a programme for a wireless earphone to make users be able to communicate with others through the MSN messenger.However,i don't know how msn send messages ,which annouce the applications the event of Audio chatting,to other applications with its APIs,and i don't want to use the HOOK.so anybody knows it?
[319 byte] By [翟奇] at [2007-12-20]
# 1

You should have a look at the Messenger developer center

http://msdn.microsoft.com/live/msnmessenger/

The activity SDK might be interesting to have a look at

http://msdn.microsoft.com/library/en-us/messengerp2p/introduction.asp?frame=true

AndreasJohansson at 2007-9-9 > top of Msdn Tech,Windows Live Developer Forums,Windows Live Messenger: Development...

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