Today, with the existing technology and the globally available information, the art of information retrieval and dissemination is more complex than ever. The libraries, the traditional carrier of valid information, cannot restrict themselves to the material they physically contain in their own premises, but should be able to locate and provide more material, like the one residing in other libraries. The Union Journal Catalogue application of NDC serves this goal for the scientific journals that are available in all Greek libraries.Using the Union Catalogue application, any user can search for the available journals in 232 libraries throughout the country, in a uniform way in a single search. But this is only the beginning of what one can do. The librarians can, additionally, order articles from the journals owned by other libraries and get the content of the articles back without walking out of their offices. After searching for the desired journals and locating the possible provider libraries, the librarians can select some of the providers, and prioritise them for each article, to handle cases where a provider cannot in fact serve the article. Afterwards they can monitor the status of the order, until it is completed. The librarians that serve articles see their pending orders in their screen, serve them by locating the printed journal and sending the article in the designated way and update the order status.