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Q: What is pseudo-conversational programming in CICS?

Answer:

Pseudo-conversational programming is a technique where the program ends between user interactions, freeing system resources.

How it works:

  1. Program sends screen to user and ends (RETURN TRANSID)
  2. User enters data and presses Enter
  3. CICS starts a new task with same program
  4. Program retrieves saved data from COMMAREA
  5. Process continues

Benefits:

  • Efficient resource usage
  • Better response times
  • More concurrent users

Implementation:

* End task, wait for user
EXEC CICS RETURN
    TRANSID('MENU')
    COMMAREA(WS-COMM)
    LENGTH(100)
END-EXEC.

* On return, check EIBCALEN
IF EIBCALEN = 0
    PERFORM FIRST-TIME
ELSE
    MOVE DFHCOMMAREA TO WS-COMM
    PERFORM PROCESS-INPUT
END-IF.
pseudo-conversational COMMAREA RETURN CICS
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Q: What is the purpose of COMMAREA in CICS?

Answer:

COMMAREA (Communication Area) is used to pass data between programs or between transactions in pseudo-conversational programming.

Uses:

  • Pass data between LINK/XCTL programs
  • Save data between pseudo-conversational transactions
  • Maximum size: 32KB

How it works:

  1. Calling program: COMMAREA option on LINK/XCTL/RETURN
  2. Called program: DFHCOMMAREA in LINKAGE SECTION
  3. Check EIBCALEN for length (0 = no COMMAREA)
* Calling program
EXEC CICS LINK
    PROGRAM('SUBPROG')
    COMMAREA(WS-DATA)
    LENGTH(100)
END-EXEC.

* Called program
LINKAGE SECTION.
01 DFHCOMMAREA PIC X(100).

IF EIBCALEN > 0
    MOVE DFHCOMMAREA TO WS-DATA
END-IF.
experienced interview
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Q: What is COMMAREA and how to use it?

Answer:
COMMAREA (Communication Area) passes data between programs and transactions. EXEC CICS LINK/XCTL COMMAREA(data) LENGTH(len). Receiving program has DFHCOMMAREA in LINKAGE. Max 32KB. Preserved across pseudo-conversational iterations.
commarea data communication
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Q: What is pseudo-conversational programming?

Answer:
Pseudo-conversational ends task after sending screen, restarts on input. EXEC CICS RETURN TRANSID(trans) COMMAREA(data). Saves resources - no task waiting for user. Must restore state from COMMAREA. Standard CICS approach.
pseudo-conversational design pattern
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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: What is CHANNEL/CONTAINER?

Answer:
Channels group containers for data passing. EXEC CICS PUT CONTAINER(name) CHANNEL(chan) FROM(data). GET retrieves. Modern alternative to COMMAREA. No 32KB limit. Typed data support.
channel container data
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Q: What is IMMEDIATE option?

Answer:
IMMEDIATE on RETURN returns without COMMAREA. EXEC CICS RETURN IMMEDIATE. Next input starts fresh - no continuation. Use when pseudo-conv not needed.
immediate return option
CICS
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Q: Explain RETURN command

Answer:
RETURN ends program or task. EXEC CICS RETURN returns to caller. EXEC CICS RETURN TRANSID(next) COMMAREA(data) for pseudo-conv. IMMEDIATE for no COMMAREA. End of logical unit.
return end task