X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 2f - multiplex - dos 4+ xma2ems.sys extension internal

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INT 2F - Multiplex - DOS 4+ XMA2EMS.SYS extension internal - INSTALLATION CHECK
        AX = 1B00h
Return: AL = FFh if installed
Note:   XMA2EMS.SYS extension is only installed if DOS has page frames to hide.
        This extension hooks onto INT 67/AH=58h and returns from that call data
          which excludes the physical pages being used by DOS.
SeeAlso: AX=1B01h

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