X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 3.x internal - get and set extended control-break checking state

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INT 21 - DOS 3.x internal - GET AND SET EXTENDED CONTROL-BREAK CHECKING STATE
        AX = 3302h
        DL = new state
             00h for OFF or 01h for ON
Return: DL = old state of extended BREAK checking
Note:   this function does not use any of the DOS-internal stacks and is thus
          fully reentrant
SeeAlso: AH=33h

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