X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 2f - multiplex - dos protected-mode interface

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INT 2F - Multiplex - DOS Protected-Mode Interface - DETECT MODE
        AX = 1686h
Return: AX = 0000h if operating in protected mode under DPMI (INT 31 available)
        AX nonzero if in real/V86 mode or no DPMI (INT 31 not available)
SeeAlso: AX=1687h

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