INT 2F - DPMI 0.9+ - GET VENDOR-SPECIFIC API ENTRY POINT
        AX = 168Ah
        DS:(E)SI = selector:offset of ASCIZ vendor name
Return: AL = status
            00h successful
               ES:(E)DI -> extended API entry point
            8Ah unsuccessful
Notes:  the vendor name is used to determine which entry point to return; it is
          case-sensitive
        available in protected mode only
        32-bit applications use ESI and EDI, 16-bit applications use SI and DI
        this call is present but not documented for DPMI 0.9
        the Borland C++ 3.1 DPMILOAD does not handle requests for entry points
          other than the MS-DOS one gracefully, producing an unhandled
          exception report; this has been fixed in the Borland Pascal 7 version
SeeAlso: INT 31/AX=0A00h,INT 31/AH=57h

Vendor names:
 "MS-DOS"       ??? and 386MAX v6.00+
 "386MAX"       386MAX v6.00+
 "HELIX_DPMI"   Helix Netroom's DPMI server
 "Phar Lap"     Phar Lap 286|DOS-Extender RUN286

Call Phar Lap RUN286 entry point with:
        AX = 0000h (function "load MSW")
        BX = new value for MSW register (low word of CR0)
Return: ???

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