Gisgraphy is available in multiple ways with add-ons :
OpenSearch is a collection of simple formats for the sharing of search results.
It is supported by Internet Explorer (for versions >= 7)
and Firefox (for versions >= 2).
It give users the ability to add the Gisgraphy search engine in the search box of the browser :
OpenSearch in Internet Explorer 7 :
OpenSearch in Firefox :
To add Gisgraphy in Firefox, go to the fulltext search page, simply click on the menu of the searchbox and select "add gisgraphy", then you will have the ability to do searches with Gisgraphy :
You can do the same In Internet explorer :
Note that you can search even if you're not on the Gisgraphy web site.