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Depends on your router, and how many wireless devices you want to use. If it is just the one laptop, I'd use MAC address blocking and only allow the laptop. The MAC address is a hard-coded hardware address for your network card, and many access points can deny *all* wireless traffic except for that specific address.
Of course, you could have lots of fun with whoever is leeching off your connection - replacing images, redirecting all traffic, etc.
Edit - using a WEP key can keep many people out, but it is crackable with not a lot of effort. WPA may be better, but I think there are tools out to defeat that as well.
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“IN MY EXPERIENCE, SUSAN, WITHIN THEIR HEADS TOO MANY HUMANS SPEND A LOT OF TIME IN THE MIDDLE OF WARS THAT HAPPENED CENTURIES AGO.”
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