VTAM application program

A program that has opened an access method control block (ACB) to identify itself to VTAM and can issue VTAM macroinstructions.; VTAM控制下的应用程序，它首先打开存取方法控制块(ACB)，以便向VTAM注册，然后可发出VTAM宏指令。参阅TCAM application program。