NetBIOS over TCP/IP (NBT)
The NBT protocol supports NetBIOS over TCP/ IP, a commonly used transport variant for NetBIOS in Windows networks where servers and clients identify themselves by unique NetBIOS names.
NBT (Netbios over TCP/IP) is a standard feature in Windows NT. It is used for Server Message Block( SMB) and is described in RFC 1001 and 1002.