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Q: How to use ENQ/DEQ?

Answer:
ENQ serializes resources. EXEC CICS ENQ RESOURCE(name) LENGTH(len). DEQ releases. Prevents concurrent access. NOSUSPEND returns immediately if busy. Use for data integrity.
enq deq lock
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Q: Explain SUSPEND command

Answer:
SUSPEND yields control to other tasks. EXEC CICS SUSPEND. Allows multitasking. Task resumes when dispatched. Use sparingly. May help long-running tasks. Usually unnecessary.
suspend yield task
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Q: How to use WAIT EVENT?

Answer:
WAIT suspends until event. EXEC CICS WAIT EVENT ECBLIST(ecb-list). Multiple ECBs. Returns when any posted. Used for synchronization. Timer events, external events.
wait event sync