The Telemon OPC Server can provide all monitoring measuring points in real time for connection to the building control system or other monitoring and control technology. at the user's disposal. The Telemon OPC Server is accessed via one or more OPC Clients, each of which can read any selection of the data objects provided by the server. Optionally, the connection between the OPC client and the Telemon OPC server can also be established via an OPC tunnel to avoid the known security gaps of the Microsoft COM technology.