INT 31 P - DPMI 1.0+ - GET DPMI CAPABILITIES
        AX = 0401h
        ES:(E)DI -> 128-byte buffer for host description (see below)
Return: CF clear if successful
            AX = capabilities (see below)
            CX = reserved (00h)
            DX = reserved (00h)
            buffer filled
        CF set on error (DPMI 0.9 only)
SeeAlso: AX=0400h

Bitfields for capabilities:
 bit 0  paged accessed/dirty supported (see AX=0506h,AX=0507h)
 bit 1  exceptions restartability supported
 bit 2  device mapping supported (see AX=0508h)
 bit 3  conventional memory mapping supported (see AX=0509h)
 bit 4  demand zero-fill supported
 bit 5  write-protect client capability supported
 bit 6  write-protect host capability supported
 bits 7-15 reserved

Format of host description:
Offset  Size    Description
 00h    BYTE    host major version number
 01h    BYTE    host minor version number
 02h 126 BYTEs  ASCIZ host vendor name

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