construction and maintenance of data processing systems and components thereof intended for Internet, intranet and extranet; configuration, administration, extension and updating of network-specific software intended for Internet, intranet and extranet systems; creation and maintenance of Internet pages; visualization and archiving of data, in particular data from production processes; setup, maintenance and updating of websites; browser-aided maintenance of data processing systems and components thereof, including software, of Internet, intranet and extranet systems; DP system consulting