The networks represent a vast system which regroups the available information in the local, national and international networks. Their role compared with the traditional information services becomes a dominant one regarding the development of their members. In 1992, all IMAG readers have a workstation connected to the local network and the library catalogs are accessible by all of them. The promotion of the service is done by the electronic mail and by direct meetings. The first results of the network activity lead us to perform three types of tasks : the information collection, the diffusion of the information, and the installation of the measuring equipments to optimize the library functioning.