external unit identifier
外部设备标识符 external unit identifier 外部设备操作码 external device operation code; externaldeviceoperationcode ..
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连接外部设备标识符 [计] connected external unit identifier
指定一种程序在执行期将利用的资源(外部设备、文件或存储区),并在源编码中提供其标识符的程序设计动作。
The programming operation of designating a resource (peripheral; file; area of storage) that will be used by a program during execution and providing its identifier in the source coding.
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