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CBL_READ_MOUSE_EVENT (↑ Mouse Routines)
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  Routine:      CBL_READ_MOUSE_EVENT
 
  Function:     Reads the mouse event queue and returns information
                about an event.
 
  Syntax:       CALL "CBL_READ_MOUSE_EVENT" USING     mouse-handle
                                                      event-data
                                                      read-type
                                            RETURNING status-code
 
  Parameters:   mouse-handle           PIC X(4) COMP-X.
                event-data             See Introduction to mouse routines
                read-type              PIC X COMP-X.
                status-code            See Key
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