Is there a way to tell if someone else is able to connect (or is connected to) with my wireless network? I want to make sure it is secure. I have it set up with one of the WEP? (I forgot which one) security passwords but when I boot up my iMac I dont need to enter a password to access it. When I switch to one of my neighbors wireless networks, some need a password and some dont. When I switch back to my wireless network I do need to enter the password.