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SVC 131

SVC 131 is a Type 3 SVC issued by the RACINIT macro instruction to determine whether a userid is defined to RACF, and whether the user has supplied a valid password, group name, and operator identification. The identification and verification of a user are based on information contained in the TSO LOGON or IMS/SIGN command, or on data in the job statement for batch jobs.

Reference Sources

IBM z/OS MVS Diagnosis Reference

IBM z/OS Security Server RACROUTE Macro Reference