Compatibility: DPMI 0.9+
Expects: AX    000aH
BX    selector
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
AX    data selector; alias of BX
Info: This creates a new data descriptor in the LDT which has the same
base and limit as the selector in BX.

The original selector can be for code or data; the returned
selector is for data.

Note: The two selectors are not kept synchronized; a change to one does
not affect the other.

See Also: DPMI API
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INT 31H 000aH: Create Alias Descriptor