OntoBroker has several switches to influence its runtime behaviour. All switches can be set in the configuration file <OntoConfig.prp> which resides in the starting directory of the server (usually the installation base directory of the server). The switches can be grouped into mainly three categories. First the user can enable the use of the internal database. A second group enables the user to modify the performance behaviour of the server. These switches depend on the use of the server and have to be used carefully. The third group allows the evaluation mode and features to be influenced. This chapter gives an overview of the different switches, well as a brief description.