Terminal session: The period of time during which a user of a terminal communicates with an interactive system, usually, it is the elapsed time from when a terminal user logs on the system until the user logs off the system.

• 终端对话期是终端用户与交互系统进行通信的那段时间。通常，它是终端用户从系统登录开始，直至用户注销系统为止所经历的时间。