Compatibility: DPMI 0.9+
Expects: AX    0002H
BX    real-mode segment address
                                                                  
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
AX    selector to access 64K starting at the real-mode paragraph
                                                                  
Info: Maps a real-mode segment address to a protected-mode selector.

Applications can use this in order to access segments such as
0040:xxxx (BIOS Data Area) and b800:xxxx (CGA/text-mode memory).

You may prefer to use INT 31H 0000H to allocate a descriptor and
then use INT 31H 0007H to point it to various real-mode
locations.

See Also: DPMI API
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INT 31H 0002H: Segment to Descriptor