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I do not know exactly which tool you refer to, and it will be against the TOS of this site to write it, but nevemind...
The "dir" might be the Google Directory: [directory.google.com...]
/claus
Google's Directory is uses the data of the Open Directory Project, the "largest, most comprehensive human-edited directory of the Web". ;-)
Here is more information about the ODP:
[dmoz.org...]
I assume, by "www listings", you mean the web results. Google is a spider search engine, which collects it's data by saving basically all websites that it can find. Several algorithms determine the importance of the web page for a certain keyword combination, and the results are displayed in order of relevancy.
Hope that helps,
--
globay