I have learned from Wikipedia that, starting with that humble beginning, PLATO established forums, message boards, online testing, email, chat rooms, picture languages, instant messaging, remote screen sharing and multiple-player games.
我从维基百科了解到 开始的时候很简陋 PLATO开发了论坛，留言板 在线测试 电邮，聊天室 图像语言，即时通信 远距离屏幕共享 和多人游戏