The Enternet^TM Controller permits maximum flexibility when producing catalogs, directories and magazines by using "selective binding." Selective binding is the process by which the stitcher or binder is controlled in the gathering process to place specific signatures, including covers, in each individual book, based on address. Additionally, variable messaging can be ink-jet printed on or within each book, in multiple locations, based on this same address data. All the above can be done without compromising line speed.

Selective binding makes possible target marketing in catalogs and directories, as well as the regionalization of national magazines. Catalogers and publishers can target their publications directly to each addressee by inserting unique advertising content based on that addressee's demographic profile or purchasing history.