They can be resident (which gives control over the startup and shutdown of the instance) or dynamic (in which they are brought on-line on demand and then terminated when idle).
它们可以是常驻(用于控制实例的启动和停止)或者动态的(需要时它们在线,空闲时被终止)。
3
That portion of a message terminated by an EOB or ETB line-control characters, if it is the last block in the message, by an EOT or ETX line-control character.