Compatibility: DPMI 0.9+
Expects: AX    000dH
BX    selector
                                                                  
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
AX    ?selector of allocated descriptor?
                                                                  
Info: This allocates one of the first 16 entries in the LDT.  Selector
values 04H-7cH are reserved for this purpose.

Note: The DPMI spec does not identify AX as a return value; so I'm
guessing here.  Also, It's not clear why you would want to
allocate one of these puppies (perhaps to make, say, 0040H work
as a descriptor to 0040:0000).

See Also: DPMI API
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INT 31H 000dH: Allocate Specific Descriptor