I decided to use the Go/Connect To Server command from the Finder on a hunch. I clicked on Local Network for the fun of it. I'm not connected to anything but the Internet via my cable modem. But it lists two people I don't know on my local network. I attempted to connect, failing. I tried using their IPs to Telnet, and I looked to see if they might be running web servers. Nothing. What are they doing there? How can I get rid of them? I certainly don't want my security compromised.