I am not very knowledgeable about wireless and routers and such, but is there a way to tell if someone is using your wireless connection? Is there a way to make it so noone else can get online? For instance, I have a Netgear WPN824 router connected to my desktop computer and I can use my laptop wirelessly. I have a friend who has a laptop with a built in wireless card and she can get online from her house, but she does not have another computer there or a router. How is she connecting and can someone know that she is apparently on their network?
I really don't understand how this all works. I just know that I made a call and said I wanted to use my laptop wirelessly, was told what I needed to buy, and then Netgear had to tell me what to do to set it up, but I have no idea what we did or why. Can you explain in simple terms?
Thanks for your help.