A method of forming conductive interconnections is disclosed herein. In order to be able to provide a fuel cell which has the membrane electrode assembly so as to have a high energy density, there is provision according to the invention for the sealing element to be pressed into the gas diffusion layer. The source delivers the brochures to a youth organization. Each watcher requests the group identifier for the presence information provided by the presentities, and receives the presence information delivered from the presence server.