INT 31H 000aH: Create Alias Descriptor

                                                    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
          INT 2fH: Multiplex Interrupt
          DOS Functions