I have some more info. looking at the settings on my laptop: c:\lanacfg showlanapaths Lana: 0-->NetBEUI Protocol-->3Com 10/100 Mini PCI Ethernet Adapter Lana: 8-->NetBEUI Protocol-->WAN Miniport (NetBEUI, Dial Out) Lana: 6-->NetBEUI Protocol-->WAN Miniport (NetBEUI, Dial Out) #2 Lana: 7-->NetBEUI Protocol-->WAN Miniport (NetBEUI, Dial Out) #3 Lana: 2-->WINS Client(TCP/IP) Protocol-->Internet Protocol (TCP/IP)-->3Com 10/100 Mini PCI Ethernet Adapter You can see that netbeui is bound to lana 0, which is where our software does its communicating with the file server. I also found this on MS's website