非常值得学习的即时通讯软件，可以实现类QQ，msn等众多即时通讯软件一样的功能-Very worthwhile to learn instant messaging software that can be achieved class QQ, msn and many other features, like instant messaging software,

利用udp协议打洞实现p2p,delphi下实现p2p，类似于QQ的整个过程 .利用delphi的indy实现此过程-Compiled with delphi 7, with the latest indy mail control, to achieve similar foxmail e-mail client program