El OPAC con valor añadido: 4o utilidades para los usuarios de los catálogos automatizadosMiguel ÁngelSánchez HerradorauthorMarianoBoza PuertaauthorAntonio T.Márquez Muñozauthor Since the appearance of the site was that the defendant OPAC fits-all innovations that have emerged. These demands have ranged from the interface to the provision of scanned documents or greater interaction with the user. In this paper we analyze the present and future profits, and suggests a classification of the same. It also explores his relationship with the portal-site of the library, as well as statutory limitations for the development of services.HM. OPACs.2005Conference Paper