Compatibility: DPMI 0.9+
Expects: AX    0003H
                                                                  
Returns: CF    NC (clear) always successful
AX    selector increment value
                                                                  
Info: When the host allocates a consecutive block of descriptors via
INT 31H 0000H (allocate LDT descriptors) or INT 31H 0100H
(allocate DOS memory block), it returns only a single, base
selector.

The value returned in AX can be added to that base selector (or
others in the series) in order to obtain the valid value of the
next selector in the series.

See Also: DPMI API
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INT 31H 0003H: Query Selector Increment Value