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  Routine:      CBL_GET_MOUSE_STATUS
 
  Function:     Finds out the number of events in the queue.
 
  Syntax:       CALL "CBL_GET_MOUSE_STATUS" USING     mouse-handle
                                                      queued-events
                                            RETURNING status-code
 
  Parameters:   mouse-handle           PIC X(4) COMP-X.
                queued-events          PIC X(2) COMP-X.
                status-code            See ◄Key►
                                    -♦-