Re: HOSTS file, Computer question...
you could limit access on the router instead of hosts files (which are easy to replace)... if you give access to any proxy sites though, then the entire internet becomes available again (ie google cache, babelfish etc).
port blocking is just as important as ip blocking for restricting access too... though if you're talking about ONLY allowing 3-4 sites, then i doubt they'd be running a ton of p2p on them.
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