An online public access catalog (often abbreviated as OPAC or simply library catalog) is an online database of materials held by a library or group of libraries. Users search a library catalog principally to locate books and other material available at a library. FNU Library borrowers may log into OPAC and search for the items they need. There are 4 methods of searching in OPAC. Basic, Advanced, Power and History. To learn more about these methods or any technical issues do not hesitate to contact your respective library staff.