X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 2f - multiplex - dos 3.3+ internal

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INT 2F - Multiplex - DOS 3.3+ internal - IOCTL
        AX = 122Bh
        BP = 44xxh
        SS = DOS CS
        additional registers as appropriate for INT 21/AX=44xxh
Return: as for INT 21/AH=44h
Notes:  equivalent to INT 21/AH=44h, but may only be called when already inside
          a DOS function call
        sets user stack frame pointer to dummy buffer, moves BP to AX, performs
          IOCTL, and restores frame pointer
SeeAlso: INT 21/AH=44h

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