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If you control your DNS internally, you can block Web sites to which your company does not allow access by adding loopback entries to your DNS or "hosts" file.
In your "hosts" file on your PCs, add lines similar to the following -- depending on what you want to block:
- 127.0.0.1 ads.doubleclick.net
- 127.0.0.1 ads.x10.com
You could also use an internal Web server address that has been set up to display a company warning about accessing inappropriate material while at work or add an equivalent entry in your DNS files. Any sites that open a bewildering array of pop-ups when you try to exit them can also be blocked in this manner.