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Google has quietly updated its Custom Search Engine tools, allowing users to create dynamic search engines that update searched domains on the fly. When you add a URL to your custom search engine, [the new tools][4] will also search any linked sites found on the page.
While it was possible to achieve this back when [Google launched the Custom Search Engine tools][2], you would have had to add each additional domain by hand and then update it every time you updated your page.
With the update Google does the hard work for you, spidering out your search to include any domain linked from your URL and it periodically updates itself to discover any additional URLs added to the page.
As the [Google Blog post][1] suggests, this is especially handy for people with large directories of links, for instance, a blog roll:
>if you have a blog or a directory-like site and don't feel like listing all of the URLs you want to search across, you can leave the work to us. With this new feature we'll automatically generate and update your CSE for you.
The feature should be handy both for bloggers look to create an easy "other sites" feed or perhaps creating custom search engine that mines a bit deeper.
Say, for instance, you're a blogger looking for more background a story, you can create a search engine that starts with your favorite link directory and then expands to search any pages linked to from that site. This allows you to potentially locate the source of a story rather than just the link scraper sites that bring it to your attention.
[via [Google Operating System][3]]
[1]: http://googlecustomsearch.blogspot.com/2007/06/custom-search-on-fly.html "Custom Search on the fly"
[2]: http://blog.wired.com/monkeybites/2006/10/google_announce_1.html "Google Announces Customized Search Engines"
[3]: http://googlesystem.blogspot.com/2007/06/super-powerful-custom-search-engines.html "Super-Powerful Custom Search Engines"
[4]: http://www.google.com/coop/cse "Google Coop: Custom Search Engines"
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