= Termination

        {END | RETurn | QUIt | EXIt | CANcel}   (No operand)

            EXI   :terminate current screen hierarchy(half of splitted)
            RET   :return to command prompt(Update is saved)
            QUI   :return to command prompt(Update is abandoned)
            END   :terminate current screen(Update is saved)
            CAN   :terminate current screen(Update is abondaned)