<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by lensman:
What about a #3: They have hijacked my computer. I want to connect to the network in my office. They are beaming their 2.4 ghz signal into my office and are hijacking my computer's network connection.</font>
Well, it's your responsbility to see to which networks you are connecting. There is a setting in you wifi card configuration that asks if you want to connect automatically to non-preferred networks. You should leave this set to "No" so that you never accidentally choose a strange network.
With this setting at no, you may get a message saying that one or more wireless networks are avilable, but you actively have to select one to connect to it.