z/OS MVS Programming: Writing Transaction Schedulers for APPC/MVS
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Syntax Conventions for the System Services

z/OS MVS Programming: Writing Transaction Schedulers for APPC/MVS
SA23-1398-00

All APPC/MVS system services have a general calling syntax as follows:
CALL routine_name        (parameters,return_code)
The specific format for invoking APPC/MVS callable services through the assembler CALL macro is:
CALL routine_name,(parm1,parm2,..return_code),VL

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