OPAC Definition from Wikipedia

An online public access catalog or OPAC is a computerized online catalog of the materials held in a library, or library system. The library staff and the public can usually access it at computers within the library, or from home via the Internet. Since the mid-1980s, it has replaced the card catalog in most libraries. Since the mid-1990s, character-based OPAC interfaces are being replaced by Web-based interfaces. OPACs are often part of an integrated library system.

In its most simple form, a library's OPAC could consist of nothing more than a simple index of the bibliographic data cataloged in the system. More complex OPACs offer a variety of search capabilities on several indexes, integrate rich content (book covers, video clips, etc.), and offer interactive request and renewal functionality.

Most integrated library systems offer a browser-based OPAC module as a standard capability or optional feature. OPAC modules rely on pulldown menus, popup windows, dialog boxes, mouse operations, and other graphical user interface components to simplify the entry of search commands and formatting of retrieved information.



OPAC new uses and concepts

Here is a link to a library that has an OPAC that uses blog concepts:


Link to Lamson's explanation of their OPAC:


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