INT 21 - TopWare Network OS v5.10+ - INITIATE ACCESS TO SPECIFIC PACKET TYPE    
	AX = FFE3h
	DL = 00h
	BX = packet type for Ethernet header (IP(Internet Protocol) The lower level (transport layer) of the TCP/IP protocol suite.	See also TCP, TCP/IP. = 0800h, ARP = 0806h, etc.)
	ES:DI -> receive routine (see #02542)
Return: CF clear if successful
	    AX = handle number
	CF set on error
	    DH = error code (03h,05h,09h,0Ah,11h) (see #02541)
SeeAlso: AX=FFE3h/DL=01h


(Table 02541)
Values for TopWare error code:
 01h	invalid handle
 03h	no interfaces of the specified type found
 05h	bad packet type
 09h	insufficient space
 0Ah	type already being accessed
 0Ch	unable to send packet (usually hardware error)
 11h	invalid function


(Table 02542)
Values TopWare receive routine is called with:
	AX = function
	    0000h request packet buffer
		CX = packet size
		Return: ES:DI -> buffer or 0000h:0000h to discard packet
	    0001h packet copied
		CX = packet size
		DS:SI -> copied packet (same as returned ES:DI above)