[xwiki-users] Modifying the Search results page?

I am trying to connect my XWiki to a third-party search engine. How can I modify the search results page? I am trying to modify this page: http://localhost:8443/bin/view/Main/Search What file corresponds to this? In general, how can I find out what file serves a URL path? (I looked in struts-config.xml, but I did not find any "search" references there.