there are p2p code ,you can look and write it,then test them.you may be interest in java or c++.

P2P\comm.cpp
...\comm.h
...\....on\comm.cpp
...\......\comm.h
...\......\Debug.h
...\......\initsock.h
...\......\protoinfo.h
...\P2PClientDemo\P2PClient.cpp
...\.............\P2PClient.h
...\.............\P2PClientDemo.cpp
...\...Server\P2PServer.cpp
...\common
...\P2PClientDemo
...\P2PServer
P2P

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