NetBIOS is the SMB based higher level protocol used by microsoft networking, it is enabled by default on top of ipx or netbeui, but not on top of tcp/ip. Its the protocol that allows you to share files and printers and so on under the different windows operating systems.
If you enable netbeui on your machine for local networking, remove the netbios binding from tcp/ip altogether. Good idea to do it anyways
Any time you use the NET command under windows you are speaking through netbios of one sort or another.
cheers
