Net Bios is a services that runs on port 139.I have seen it many times, when port scanning.
However, I have never been able to interact with this service,using a telnet/hyperterminal.

Questions: Do I need a client designed for NetBios sessions? Where can I find it?

Am I just not using the correct term type? What is the Term Type, how can I find it?

What programs are used with this service/port.....Netmeeting, ISP connection, ect... ???

This port often shows open on my local machine at home, should I be concerned about a security hole?

I am sorry if these are pretty vauge questions, but this is literally all I know about this peticular service. Any and all info would help me come to a better understanding of all of this.