Billing, accounting and invoicing in an electronic manner or not; administrative management; administrative processing transactions, demonstrating and acting professionally as an intermediary and/or advisor relating to computer networks and telecommunication networks including radio and satellite connections and the Internet and connecting equipment on afore-mentioned networks, such as equipment for transmitting messages and data bases and programs to be applied, network services such as making transactions (electronic banking, booking a seat/passage, booking in general, shopping, etc); renting data bases on carriers; telemarketing activities or professional intermediary and support relating thereto; searching data in data bases, providing data from data bases; keeping data bases up-to-date; alerting services on the basis of search profiles to be defined by the subscriber; all afore-mentioned services for the purpose of providing interactive data