This occupies the right hand side of the window, overlaying the document display area, pool of relevant documents and part of the button bar (see later sections) while thesaurus navigation is in progress. It presents the word or phrase which the user has chosen for navigation at the top of the display, and its broader, narrower and related terms in separate panes below. Any term within this display can be selected for inclusion in the working query, or for further navigation. To quit the thesaurus, users must click Back on the button bar.