On another forum I asked for help in securing my wireless network. I was advised to go to Apple support and read an article on how to set up a wireless network. Using Leopard, I have a wireless connection that accesses Internet. I am using an Airplus Xtreme router. My wife's PC computer uses the same router, but we do not share files. I have WEP password protection. When I go to the Airport Utility (as per the support instructions), it says it can't locate any Apple Wireless devices, so I can't open it. I assume that is because my D-Link wireless is not an Apple device? I have configured the firewall to be stealth and my data is encrypted though System Security. Here is my problem: 1. On the Airport Icon page, I have two wireless networks that I can access. One is named Gary (made for me by a consultant who came to my house to set up my wireless connection for my old PC.) The other network appears as Linksys. I can access either of these networks using my password. When I am in Gary, both networks do not have a padlock icon next to them. According to System Pro-filer The Linksys address is 192.168.1.109 and the Gary network address is 192.168.0.100. Questions: could I have been using my neighbor's network by accident? When I bought the Mac the salesman said just turn it on and it will locate the nearest connection, so I assumed that Linksys was my network and used it for several months. (After checking today, it accepts my password to get in the Linksys network.) However, last week when doing a Clamxav virus check, I openned Shared Users file for a scan (my computer is set not to share files with another computer), but suddenly I noticed the name of my neighbor' son as a shared computer. (It listed his first and last name.) When I clicked on that shared file name, it said "Internet connection lost." Then the name disappeared and never returned. This is potentially serious because my neighbor's son is also my student and if he hacked into my computer, he could have access to all of my exams. What is going on here? I have spent the last week reading about sniffing, changed my passwords and trying to harden my wireless connection. I looked closely at the Activity Monitor, but can't seem to see any program that seems strange. What should I do?