- In IMS/VS, a program communication block that supports communication between an application program and a terminal or other application program.There are two types of DC-PCB I/O PCB and alternate PCB.; IBM的信息管理系統(tǒng)IMS/VS中的一種程序通信塊,它支持應用程序與終端間或與其它應 用程序間的通信。有兩種類型的DC-PCB:I/O PCB和替代PCB。
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