Format of NDIS request block for GetProtocolManagerLinkage:
Offset	Size	Description	)
 00h	WORD	04h
 02h	WORD	returned status (see #01434)
 04h	DWORD	returned dispatch point
 08h	DWORD	unused
 0Ch	WORD	returned protocol manager DS
Note:	the dispatch point may be called as follows instead of using this IOCTL
	STACK: WORD  protocol manager DS
	       DWORD pointer to request block
	Return: AX = returned status
		STACK popped
SeeAlso: #01424,#01425,#01426,#01428,#01429,#01430,#01431,#01432,#01433