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I've got a Sony Vaio Centrino based laptop w/Integrated wireless LAN. So if your laptop is new and has integrated wireless lan you won't need a wireless network card since it's built in.
I'm not sure if you can do peer to peer with it though. I know there's a option that allows you to configure your internet connection to allow others to surf through it though.
So I guess it may be possible to do what you want, provided you are able to network peer to peer with the laptop and configure your laptop connection to allow other systems on the network to surf through it.
Having a wireless router would be the ideal way though.
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