INT 31 P - DPMIsee DOS Protected-Mode Interface 0.9+ - SEGMENT TO DESCRIPTOR
	AX = 0002h
	BX = real mode segment
Return: CF clear if successful
	    AX = selector corresponding to real mode segment (64K limit)
	CF set on error
	    AX = error code (DPMIsee DOS Protected-Mode Interface 1.0+) (8011h) (see #03143)
Notes:	multiple calls for the same real mode segment return the same selector
	the returned descriptor can never be modified or freed
	not supported by MS Windows 3.0 in Standard mode