In DPCX, a unit of work for the process or that is used for the execution of a program or a system function.
在分布式处理控制执行程序(DPCX)中，用于执行一个程序或一个系统功能的一种处理机工作单位。
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In DPCX, communication between an application program and a terminal during which the operator enters data without regard for any predefined form or field.