Format of WINX server buffer:
Offset	Size	Description	)
 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	DWORD	result (01h)