I decided to try Shield Test at http://grc.com on my mothers basic Windows 98 install with a dial up connection. She doesn't have a firewall, and I was really curious to see if her ports were at least closed. It turns out that only two of her ports that were tested were stealth. One, port 138, was wide open, and the rest were just closed. I think the test said that the open port was the NetBios port. What could a malicious user do to get through this security hole? What kind of things could happen if she left this unprotected? Trying to convince her to get a firewall is an impossible task.