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I'm not sure, but I think there's a different icon for a adhoc network rather than the normal wifi connection people are used to looking at. I'll try to get a confirmation on that tomorrow at work.
The next time you're at an airport looking for a wireless hot spot, and you see one called "Free Wi-Fi" or a similar name, beware -- you may end up being victimized by the latest hot-spot scam hitting airports across the country.
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