The main components of platform topology services are discovery modules that find managed resources, store information about them in the database of the management platform and poll them for configuration and state changes at regular intervals. The information in the database is then used to display a model of the network and its resources in a hierarchy of so-called submaps on the user interface. An operator may navigate through the submaps and examine their content by selecting the symbols representing managed resources. By extending the topology tervices for the management of CORBA systems and applications, we achieved not only a common user interface for monitoring network components, computers and applications, but also an integrated Management Information Repository inside the platform. Section IV-B will describe this in detail.