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Q: What is EIB?

Answer:
EIB (Execute Interface Block) contains execution info. EIBCALEN=COMMAREA length. EIBTRNID=transaction. EIBAID=attention key. EIBDATE/EIBTIME=date/time. EIBRESP/EIBRESP2=response codes. Automatically available in COBOL.
eib interface block
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Q: How to check EIBAID?

Answer:
EIBAID shows attention key pressed. Compare with DFHENTER, DFHPF1-24, DFHCLEAR, DFHPA1-3. Example: IF EIBAID = DFHPF3 do-exit. Determines user action on screen.
eibaid key attention