有关nat穿透源码（包括相关文档，相关工具）

XMail is an Internet and intranet mail server featuring an SMTP server, POP3 server, finger server, multiple domains, no need for users to have a real system account, SMTP relay checking, RBL/RSS/ORBS/DUL and custom ( IP based and address based ) spam protection, SMTP authentication ( PLAIN LOGIN CRAM-MD5 POP3-before-SMTP and custom ), a POP3 account syncronizer with external POP3 accounts, account aliases, domain aliases, custom mail processing, direct mail files delivery, custom mail filters, mailing lists, remote administration, custom mail exchangers, logging, and multi-platform code. XMail sources compile under GNU/Linux, FreeBSD, OpenBSD, NetBSD, OSX, Solaris and NT/2K/XP.

Beej的socket教材，非常经典的东西-Beej socket materials, very classic things

通过用vb.net+access开发网上书店。-By using vb.net+ access developing an online bookstore.

组播网络程序测试,对于学习组播技术有帮助-Multicast network testing, the study has helped Multicast Technology

清除页面广告的程序-removal procedures

tcp测试程序，可以模拟服务器和客户端，并且可以用文本和2进制来看结果-tcp test procedure can be simulated server and client, and can use text and two-band view of the results

基于Java的FTP源码，可以作为FTP开发参考-Java-based FTP source can be used as reference to the development of FTP

用vc实现的域名查找工具-vc used to achieve the domain search tool

1st-pay.rar 在线支付程序-1st-pay.rar online payment procedures

VC实现PING的各个参数,是学习SOCKET编程的 不错参考程序,代码清晰,可读性好-VC PING various parameters, is learning Socket Programming good reference program, code clear and readable