z/OS MVS Programming: Sysplex Services Guide
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Registers on Exit

z/OS MVS Programming: Sysplex Services Guide
SA23-1400-00

Register Contents
GPR 0 Can contain application-specified data to be provided to the group user routines if the return code in GPR 15 matches the value in SEPLSTCH. Otherwise, no requirement. See the description of the GEPLUDAT field in the GEPL for information about how register 0 is used to pass application-specified data.
GPR 1 - 13 No requirement.
GPR 14 Unchanged.
GPR 15 Return code.
ARs 0 - 15 No requirement.

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