INT 31 P - DPMIsee DOS Protected-Mode Interface 0.9+ - GET SEGMENT BASE ADDRESS
	AX = 0006h
	BX = selector
Return: CF clear if successful
	    CX:DX = linear base address of segment
	CF set on error
	    AX = error code (DPMIsee DOS Protected-Mode Interface 1.0+) (8022h) (see #03143)
Note:	not supported by MS Windows 3.0 in Standard mode
SeeAlso: AX=0007h,INT 21/AX=3504h