The Control Center Server is the optional central server component of the PKE Management Systems. The application combines all centralized tasks within a server, such as database access or user management. The server provides a set of services and system features that centralize a management installation. Each service is designed so that failure of the server can not disrupt the overall system. All services are individually optionally usable, i. depending on the requirement of the management components to use. The services are accessed exclusively via a hardened and, if necessary, visible XML protocol based on a TCP / IP connection.