INT 31 P - CauseWay - "Info" - GET SYSTEM SELECTORS/FLAGS
	AX = FF00h
Return: AX = selector for flag address space (base 00000000h, limit 4GB)
	BX = selector for current PSPsee Program Segment Prefix segment (limit 0100h)
	(E)CX = size of DOS transfer buffer (max 64K)
	DX = real-mode segment address of DOS transfer buffer
	ES:(E)SI = protected-mode address of DOS transfer buffer
	EDI = system flags (see #03162)
Program: CauseWay is a 386 DOS extender by Michael Devore and John Wildsmith
	  for use with Watcom C++ or assembly language programs
Notes:	the entire transfer buffer can be addressed with a 16-bit offset in
	  protected mode
	CauseWay always maps selector 0040h to the BIOS(Basic Input/Output System) A set of standardized calls giving low-level access to the hardware.  The BIOS is the lowest software layer above the actual hardware and serves to insulate programs (and operating systems) which use it from the details of accessing the hardware directly. data segment at
	  real-mode segment 0040h; when not running under a DPMIsee DOS Protected-Mode Interface host, CauseWay
	  also provides selectors A000h, B000h, and B800h mapped to video
	  memory
SeeAlso: AX=FF25h


Bitfields for CauseWay system flags:
Bit(s)	Description	(Table 03162)
 0	32-bit code
 1	virtual memory manage enabled
 3-2	mode: 00 raw extended memory, 01 VCPIsee Virtual Control Program Interface, 10 DPMIsee DOS Protected-Mode Interface
 4	DPMIsee DOS Protected-Mode Interface available
 5	VCPIsee Virtual Control Program Interface available
 6	no memory managers
 7	application descriptor table type: 0 = GDT, 1 = LDT
 14-8	reserved
 15	debugging engine present