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Assuming that you have a cgi-bin script accessed by /cgi-bin/Catalog, if you try to access /cgi-bin/Catalog/Sport/Cars/, then you call the cgi-bin with PATH_INFO instead of regular parameters. This may be very convenient if you want to give users an intuitive access to a thematic catalog. Catalog provides support for this kind of usage in the following way.
If the PATH_INFO environment variable is set when the navigation cgi-bin is called, Catalog behaves as if called with the pathcontext context and the pathname parameter is set with the value of PATH_INFO, See section Intuitive navigation (pathcontext),
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