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INT 60 - FTP Packet Driver - BASIC FUNC - ACCESS TYPE
        AH = 02h
        AL = interface class
        BX = interface type
        DL = interface number
        DS:SI -> type
        CX = length of type
        ES:DI -> receiver
Return: CF set on error
            DH = error code (see AX=01FFh)
        CF clear if successful
            AX = handle
SeeAlso: AH=03h"FTP"

Receiver is called with
        AX = subfunction
            00h application to return pointer to buffer in ES:DI
                returned ES:DI = 0000h:0000h means throw away packet
            01h copy completed
                DS:SI -> buffer
        BX = handle
        CX = buffer length
when a packet is received