X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 2+

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INT 21 - DOS 2+ - EXTENDED CONTROL-BREAK CHECKING
        AH = 33h
        AL = subfunction
            00h get state
                Return: DL = current BREAK setting
                            00h BREAK=OFF
                            01h BREAK=ON
            01h set state
                DL = 00h for OFF or 01h for ON
Return: AL = FFh if error
Note:   under DOS 3+, this function does not use any of the DOS-internal stacks
          and is thus fully reentrant
SeeAlso: AX=3302h

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