CICS ⭐ Featured
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Q: Explain CICS regions

Answer:
CICS region is address space. TOR (Terminal Owning) owns terminals. AOR (Application Owning) runs programs. FOR (File Owning) owns files. MRO connects regions. Workload distribution.
region tor aor
CICS ⭐ Featured
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Q: What is SYSID?

Answer:
SYSID identifies CICS system. 4-character name. EXEC CICS ASSIGN SYSID(ws-sysid). Or in RDO definitions. Used for MRO routing, function shipping. Remote file/program SYSID option.
sysid system mro
CICS
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Q: What is MRO?

Answer:
MRO (Multi-Region Operation) connects CICS regions. Function shipping sends requests to owning region. Transaction routing sends terminal to AOR. DPL (Distributed Program Link) for remote LINK.
mro distributed regions