user exit queue

In ACF/VTAM, a structure used to serialize the execution of application program exit routines. Only one exit routine on each user exit queue can run at a time.; 通信系统ACF/VTAM中的一种结构体，用于串行化地执行应用程序的出口例行程序.在同一时 刻，每一个用户出口队列只能运行一个出口例行程序.