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Q: Explain NOTIFY parameter

Answer:
NOTIFY=userid sends message when job completes. On JOB card. Multiple userids: NOTIFY=(USER1,USER2). Notifies success or failure. TSO users get message at terminal. Essential for batch monitoring. Commonly NOTIFY=&SYSUID for submitter.
notify message completion
COBOL
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Q: What is RETURN-CODE register?

Answer:
RETURN-CODE sets program completion status. MOVE 0 TO RETURN-CODE (success). MOVE 8 TO RETURN-CODE (warning). Passed to caller/JCL. Check RETURN-CODE after CALL. LE uses CEE3STS for detailed status.
return-code status completion
JCL
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Q: What is MSGLEVEL parameter?

Answer:
MSGLEVEL=(statements,messages). Statements: 0=JOB only, 1=all JCL, 2=input JCL. Messages: 0=completion only, 1=all including allocation. MSGLEVEL=(1,1) shows everything. MSGLEVEL=(0,0) minimal output. Affects JESMSGLG.
msglevel output logging
CICS
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Q: What is CICS asynchronous processing?

Answer:
RUN TRANSID for async execution. EXEC CICS RUN TRANSID(xx) CHILD. FETCH CHILD waits for completion. Modern async pattern. Alternative to START.
async run child