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  Routine:      CBL_GET_KBD_STATUS
 
  Function:     Checks whether there is a character waiting to be
                read from the keyboard.
 
  Syntax:       CALL "CBL_GET_KBD_STATUS" USING     key-status
                                          RETURNING status-code
 
  Parameters:   key-status             PIC X COMP-X.
                status-code            See ◄Key►
                                    -♦-