z/OS TSO/E REXX Reference
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Functions supported for the user ID routine

z/OS TSO/E REXX Reference
SA32-0972-00

The function to be performed by the user ID routine is specified in parameter 1. The valid functions are described below.
USERID
Returns the same value that the USERID built-in function would return in an environment that is not integrated into TSO/E. The value returned may be a user ID, a stepname, or a jobname. You can use the USERID function only in environments that are not integrated into TSO/E.
TSOID
Returns the same value that the USERID built-in function would return in an environment that is integrated into TSO/E. The value returned is the TSO/E user ID. You can use the TSOID function only in a TSO/E address space in an environment that is integrated into TSO/E.

The TSOID function is intended for use if an application program calls the user ID routine, IRXUID, in a language processor environment that is integrated into TSO/E to obtain the user ID. You can also use the TSOID function if you write your own user ID routine and then call your routine from application programs running in environments that are integrated into TSO/E.

TSOID is intended only for language processor environments that are integrated into TSO/E. Because you can replace the user ID routine only in environments that are not integrated into TSO/E, your replaceable routine does not have to support the TSOID function.

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