Configuration of GLUT applications is quite different than configuration of VR Juggler applications. In particular, VR Juggler is much more dynamic because configurations are maintained as files separate from the application. In GLUT, the configuration must be written into the application somehow. This can lead to very static, hard-coded configurations.
VR Juggler has a powerful and flexible configuration system. As a result, it is also complex. All configurable parameters could be in one or more files with any names desired. VR Juggler comes with example configuration files that may be found in the directory $VJ_BASE_DIR/share/vrjuggler/data/configFiles.
The VR Juggler configuration system is completely extensible and could be used outside of VR Juggler. Indeed, it could be used outside of any VR paradigm altogether. Refer to the VRJConfig Guide for more information on configuring VR Juggler.