示范如何用软件设置防火墙，允许某个应用程序穿过防火墙。用C#编制。 -Demonstrate how to set up an firewall exception to allow a certain application pass through firewall.

UDP通信实现，客户端和服务器端，使用说明见源码 [UDP.rar] - 本例是采用UDP通信，包括服务器与客户端，包括数据重传机制和异常处理机制 [UDPtest.rar] -The UDP traffic implementation, the client and server side, see the source code [UDP.rar]- in this example is the use of UDP traffic, including server and client