坦克大战游戏，包括服务器和客户端，要正确测试坦克大战程序，首先需要开启服务器程序，然后用4个客户端去连接服务器。 -Battle City game, server and client to be properly test Tankedaizhan program, you first need to open the server program, then use the four client to connect to the server.