how works applications which blocks web sites?

Posted by noisy on Stack Overflow See other posts from Stack Overflow or by noisy
Published on 2010-06-12T23:34:51Z Indexed on 2010/06/12 23:42 UTC
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network

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system

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programming

I know only one low-level way of blocking websites - hosts file. However, it is obvious that main stream programs has some other way of achieving this.

I have an idea for new model of this kind of program, but without possibility of blocking sites it is useless :(

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