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My son is addicited to an online solitaire site and I want to block it so he cannot access it without blocking other sites. Ideas?

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I don't want to change security settings. I just want to know how to permanently block one particular site.

I don't want to change security settings. I just want to know how to permanently block one particular site.

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There is no secure way of blocking a page. A fairly experienced user could always circumvent measures preventing them from using a single website. You could try using the parental control settings of your operating system, or use your internet gateway to block the page.

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You can block specific websites with the HOSTS file.
http://en.wikipedia.org/wiki/Hosts_file