In computing shows all divisions which are related to computing. However, it has a volume of on-line information that is important enough in itself to warrant a set of direct links from the Welcome page. Documentation and newsletter index is quite general, not necessarily about computing alone. As a physics laboratory, CERN's primary goal is to provide the environment for physics experiments. Systems and Services CERN develops systems and provides services to its users.
Systems are usually special software or software libraries for aid in constructing physics programs.
Services are provided for economy of scale. Both systems and services have names or acronyms. In addition, systems usually have an associated service, so both of them have been collected in the same place and in alphabetical order. Physicists around the world collaborate. The laboratories document lists the HEP sites providing information in W3.