network adapter

hello i have a little difficult problem
searchengines could not help me yet

i have 2 zigbee (standard for wireless personal area networking, such as bluetooth) cards, connected to the pc's via usb
now i'd like to programm (in C or C++) a network adapter to manage a TCP/IP connection over my cards (under windows 2000)
i have a library with routines for sending data with these cards
but i couldn't find anything about programming a network adapter
so that i can send the tcp/ip packets from this adapter over my cards

if anybody has some links, information, sourcecode or whatever could be helpfull, i would be very glad

regards and thx in advance
hitchiker