TCPIP测试工具，学习消息控制。分Server和Client.-TCPIP testing tools, learning the message control. Sub Server and Client.

UDP通信，Windows 应用程序向子网发送广播信息，同时接受子网中任意主机发送的广播信息。-UDP traffic, Windows application, send a broadcast message to the subnet, subnet also accept any broadcast messages sent by the host.