One of the basic changes that took place during the last decade (a transition towards an information society included), is certainly the change in the interlibrary loan with other countries. Two essential points that will be dealt here are the Internet support to the libraries in cooperation and the electronic loan within the centralized electronic systems such as SUBITO der Lieferdienst der Bibliotheken and GBV, Gemeinsamer Bibliotheksverbund, two German systems the University Library "Svetozar Marković" in Belgrade mostly cooperated with during the last year.