Here users can hone their search, using multiple databases and multiple keywords or other index types. Depending on the database, results can be limited by numerous criteria—such as language, format, or library holdings—as well as ranked. A Find Subjects Heading icon leads to thesauri available in certain databases, helping the user refine or find alternate subject headings. The Index icon permits browsing of a database’s indexes, useful when the user is unsure of a search term’s spelling or format.