一个简单的tcp-ip协议，开设一个时间服务器，和一个时间查询的客户端，目的熟悉tcp-ip的协议。。。。。适合课堂演示。-A simple tcp-ip protocol, set up a time server, and a time to query the client, the purpose of tcp-ip familiar with the agreement. . . . . Suitable for classroom demonstration.