在分布式处理控制执行程序(DPCX)中，应用程序和终端之间的通信的一种方式，通信期间操作员可以不管预定的格式或字段而输入数据。
In DPCX, communication between an application program and a terminal during which the operator enters data without regard for any predefined form or field.
控制台：一个特殊的终端类型。一些UNIX系统的操作必须要在控制台运行。只允许系统操作员和管理员有此权限。
Console: a special type of terminal. Some UNIX system operations must be performed at the console. Only accessible by the system operators, and administrators.
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