INT 1B - CTRL-BREAK KEY                            

        This interrupt is called  when  the  keyboard scanner of the
        IBM  machines detects CTRL and BREAK  pressed  at  the  same
        time. It normally points  to  a  short  routine in DOS which
        sets  the  Ctrl-C  flag, thus invoking INT 23h the next time
        DOS checks for Ctrl-C.

See Also Int/23h 0040:0071 33h


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