Int 21 Fn FFE3  - Topware Network OS V5.10+ - Initiate Access To Specific  [N]

   AX = FFE3h
   DL = 00h
   BX = packet type for Ethernet header (IP = 0800h, ARP = 0806h, etc.)
   ES:DI -> receive routine (see below)

Return: CF clear if successful
       AX = handle number
   CF set on error
       DH = error code (03h,05h,09h,0Ah,11h) (see below)

See Also: AX=FFE3h/DL=01h

Values for 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

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)