netbeui

NetBEUI (NetBIOS Extended User Interface) is a network transport protocol.

NetBIOS is software interface for accessing network resources. It is used by the Windows tools, like user manager, RAS manager, server manager etc.

The most common uses for it on Windows networks are WINS and file sharing via the Network Browser.

check these:
http://www.winnetmag.com/Windows/Article/ArticleID/117/117.html

http://www.chicagotech.net/netbios&wins.htm

Pronounced net-booey, NetBEUI is short for NetBios Extended User Interface. It is an enhanced version of the NetBIOS protocol used by network operating systems such as LAN Manager, LAN Server, Windows for Workgroups, Windows 95 and Windows NT.
Netbeui was originally designed by IBM for their Lan Manager server and later extended by Microsoft and Novell.

NetBeui is a protocol (language) a computer users to communicate to other computers on the network (not routable, or doesn't travel over Routers). More commonly today is TCP/IP, IPX/SPX. Remember in order for two persons co communicate they have to talk the same language. Hope that helps out.