Compatibility: DPMI 0.9+
Expects: AX    0006H
BX    selector
                                                                  
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
CX:DX 32-bit linear base address of the segment
                                                                  
Info: This obtains the 32-bit linear base address of the segment
identified by the selector in BX.

Use the LSL opcode to query the limit.

See Also: DPMI API
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INT 31H 0006H: Query Segment Base Address