远程终端管理系统：包括客户端，服务器，心跳，心跳异常，登录，密码隐藏，退出，挂起，私聊，群聊，shell命令，等功能的实现-Remote terminal management system: including clients, servers, heartbeat, abnormal heartbeat, login, password, hide, withdraw, suspend, private chat, group chat, shell commands, and other