说明：  在两台计算机上分别运行服务器程序和客户程序，待程序启动并建立连接后，客户端把键盘输入的数据发给客户端；服务器将从服务器接收的数据显示在屏幕上。
(Both computers are running the server program and the client until the program starts and the connection is established, the client to keyboard input data to the client server from the server receives the data displayed on the screen.)