How can I keep certain pages from being indexed by search engines and other spiders?

Two methods: You can insert a NO INDEX meta tag on specific pages, and you can also upload a robots.txt file that gives instructions to crawlers and refuses some malicious spiders (the kind that harvest email addresses and such). You can keep them away from a few pages, a directory, or a whole site.

You can google "noindex tag" to find more resources, but here is a good place to start:
http://www.searchengineworld.com/metatag/robots.htm

And here is a site all about robots.txt files:
http://www.robotcop.org/links.html

Caution: Malicious bots can ignore both methods. If there is something you truly wish to hide, do not post it on public pages that are not password-protected.

If there is a specific bot you wish to avoid, you can use .htacess, editable from the control panel, to block it the IP address.

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