Turn wifi laptop to an access point
Found a video tour in CNET to let you turn a laptop to a hot spot. Actually I did this before at least 3 years ago. :)
Basicly, use Windows XP's connection sharing, and make the wireless network working on ad hoc mode. Other laptop use "ad hoc" mode to join the ad hoc network and share the same Internet connection. (The computers in a ad-hoc wifi network is just like computers connected to a hub)
From the video tour it seemed that with Windows Vista and Mac OSX, it will be much easier.
Though it worked, believe me, it's much better to buy a Apple Airport Express, its user expereince is much much better.

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