z/OS Language Environment Writing Interlanguage Communication Applications
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File sharing under PL/I multitasking

z/OS Language Environment Writing Interlanguage Communication Applications
SA38-0684-00

Files can be opened by COBOL programs that are running in the main task or in a subtask. However, when the task terminates, all open files, external and non-external, defined in COBOL programs within the task, are closed.

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