MOVE 1 TO FOCUS-POSITION.
MOVE 2 TO FOCUS-POSITION-MAX.
MOVE SPACE TO END-STATUS.
MOVE SPACE TO WINDOW-STATUS.
*
PERFORM UNTIL END-STATUS = "P9"
             OR WINDOW-STATUS = "EXIT"
*
  EVALUATE FOCUS-POSITION
    WHEN 1
          ACCEPT ACEP-A-ACP
          EVALUATE END-STATUS
            WHEN "09"
                SUBTRACT 1 FROM FOCUS-POSITION
            WHEN OTHER
                DISPLAY ACEP-A-DSP
                PERFORM ACEP-A-CHECK-SUB
                IF ERR-FLAG = 1
                  THEN
                      DISPLAY ERROR-MSG-A
                  ELSE
                      ADD 1 TO FOCUS-POSITON
                END-IF
          END-EVALUATE
    WHEN 2
          ACCEPT ACEP-B-ACP
          EVALUATE END-STATUS
            WHEN "09"
                SUBTRACT 1 FROM FOCUS-POSITION
            WHEN OTHER
                DISPLAY ACEP-B-DSP
                PERFORM ACEP-B-CHECK-SUB
                IF ERR-FLAG = 1
                  THEN
                      DISPLAY ERROR-MSG-B
                  ELSE
                      ADD 1 TO FOCUS-POSITON
                END-IF
          END-EVALUATE
    WHEN OTHER
          CONTINUE
  END-EVALUATE
*
  IF FOCUS-POSITION = 0
    THEN MOVE 1 TO FOCUS-POSITION
  END-IF
*
  IF FOCUS-POSITION > FOCUS-POSITION-MAX
    THEN MOVE "EXIT" TO WINDOW-STATUS
  END-IF
*
END-PERFORM.