INT 2F - WINX - RETURN ADDRESS OF SERVER BUFFER                                 
	AX = F201h
Return: AX = status
	    FFFFh if WINX is busy processing a different request
	    0000h if successful
		BX:CX = address of server buffer (see #03125)


Format of WINX server buffer:
Offset	Size	Description	(Table 03125)
 00h	BYTE	command/status
		00h buffer available
		01h buffer contains result
		02h change directory
		03h execute program
		FFh terminate windows portion of WINX
 01h  ? BYTEs	command (03h) or directory (02h)
  or
 01h	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	result (01h)