Introduction - If you have any usage issues, please Google them yourself
A simulated P2P chat source code, the process of the process is very simple, P2PServer run on a computer with public IP, P2PClient after operation in two different NAT (note that if the two client runs after a NAT, the program may not run normally, it depends on whether your NAT support loopback translation, see http://midcom-p2p.sourceforge.net/draft-ford-midcom-p2p-01.txt, of course, this problem can be through the first tries to connect the other side of the IP network to solve, but the code is to verify that principle, does not deal with these problems), log on first login after the computer can get the computer user name and login after the computer through the send username message format to send messages. If you are successful, you have succeeded in connecting directly with the other person.