使用TCP/IP协议的应用程序通常采用应用编程接口：UNIX　BSD的套接字（socket）和UNIX System V的TLI（已经被淘汰），来实现网络进程之间的通信。就目前而言，几乎所有的应用程序都是采用socket，而现在又是网络时代，网络中进程通信是无处不在，这就是我为什么说“一切皆socket”。(Applications that use the TCP/IP protocol usually use the application programming interface: UNIX BSD sockets (socket) and UNIX System V TLI (which have been eliminated) to communicate between network processes. For the moment, almost all applications are using socket, and now is the Internet era, the process of communication in the network is everywhere, and that is why I said, "everything is socket."".)