*COMDECK IMSPOA 
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*1DC POA - PIP OVERLAY AREA 
* 
*     POA IS A BUFFER AREA USED BY PIP TO HOLD ITS OVERLAYS.
*     AT INITIALIZATION OF NIP PIP RETURNS NECESSARY SIZE TO NIP WHEN 
*     IT IS CALLED WITH FUNCTION TYPE 1, AND LOADS ITS OVERLAYS TO
*     THE AREA PROVIDED BY NIP WHEN IT IS CALLED WITH FUNCTION TYPE 2.
* 
*                                  2                    5 
*                0      6          4                    9 
*               I------I----------I--------------------I-I
*     HEADER    I      I          I                    I I
*      WORD     I  ID  I    BS    I ////////////////// ICI
*               I------I----------I--------------------I-I
* 
*     HEADER HAS ITEMS: 
*       POAID = PIP OVERLAY AREA ID = 42
*       POABS = POA BLOCK SIZE
*       POAC  = COMPLETION FLAG SET WHEN OVERLAY LOADING IS DONE. 
* 
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