4.2.1.15 Congress recalled that the objective of the WWW Operational Information Service (OIS) was to collect from, and distribute to, WMO Members and WWW Centres detailed and up-to-date information on facilities, services and products made available in the day-to-day operation of the WWW. Congress was pleased to note that the updated operational information was available on the WMO server. Since the overall efficiency of the OIS depended on the prompt notifications of changes and updated information from NMHSs, Congress stressed the importance that all Members continue to review the operational information and update it as required."  Seventeenth World Meteorological Congress