подскажите что такое PG_NOF_UINLISTS ?

int RnQ_GetGroupNum( void ) {

    DWORD   iAPos,iPos,
            *pCommunication;
    BYTE    *bComm,
            bAnswer[ANSW_LEN],
            bMsgType;
    INT     listNum,
            iLen;
 
    iAPos = 4;
    bAnswer[ iAPos ++ ] = PM_GET;
    bAnswer[ iAPos ++ ] = PG_NOF_UINLISTS;

    iAPos -=4;
    memcpy( bAnswer, &iAPos, 4 );
    pCommunication = funcCallback( ( DWORD* ) bAnswer );
 
    if ( ! pCommunication )
        return 0;
 
    memcpy( &iLen, pCommunication, 4 );
 
    iPos=4;
    bMsgType = bAnswer[ iPos ++ ];

    if( bMsgType != PM_DATA ) {
        MessageBoxA( 0, "ERROR", "PM_DATA", 0 );
        return -1;
    }

    bComm = ( BYTE* ) ( pCommunication );

    RQ_GetINT( bComm, &iPos, iLen, &listNum );
 
    return listNum;
}