利用Visual C++的Windows SOCKET网络编程实现局域网内正在使用本程序的所有主机的群聊、两主机之间的点对点聊天和文件传送功能，且具有以下特点：通信完全是异步的；各用户是对等的，不区分客户机和服务器，任何用户启动或关闭程序都不会影响其他用户的正常使用；使用多线程传输文件。

-using Visual C Windows Socket Programming Network is bringing LAN use this procedure in the mainframe group chat, between the two hosts and peer-to-peer file transfer chat function, which has the following features : Asynchronous communication is completely; users on the other, no distinction between client and server. Any user to toggle on or off the procedure will not affect other users of normal use; use multithreading to transfer files.