NetBIOS over TCP/IP (NetBT) allows for the transport of NetBIOS applications over TCP/IP. This is a largely for legacy application support, because NetBIOS does not scale well. However, in principle, NetBT can project NetBIOS over the Internet.
NetBIOS Naming Service (NBNS) is part of the the NetBT implementation. Each application a NetBIOS network needs to register a unique 15 character name. Microsoft adapted NBNS for is Windows Internet Name Service (WINS).
References:
http://technet.microsoft.com/en-us/library/bb727013.aspx
http://www.practicallynetworked.com/sharing/troubleshoot/netbt.htm