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true you don't need a wireless card for each computer.. but if there's only two computers it's cheaper to just get two. then you don't need any kind of access point or router or nothing.. just the two wireless card.
there are two ways to configure them, either infrastrucutre (if you are using an access point) or ad-hoc (the wireles cards will talk to each other.)
two wireless cards is cheaper than 1+router...
but either way will work.
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