The "reader" for all Logos eBooks is the Libronix Digital Library System. As a library system, Libronix DLS helps you catalog, retrieve, view, search and annotate your electronic books. The unique power of Libronix is only realized with a full library of books, but the system can be used to hold just a single title, if desired. As additional titles are added, they are integrated into the library, like books on a shelf.