INT 31H 0007H: Set Segment Base Address

                                                    Compatibility: DPMI 0.9+ 
 Expects: AX    0007H
          BX    selector
          CX:DX 32-bit linear base address to apply to the selector
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 Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
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    Info: This changes the base address for a descriptor in the LDT.  It
          makes selector BX refer to a different location in physical
          memory.

See Also: DPMI API
          INT 2fH: Multiplex Interrupt
          DOS Functions
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