Abstract: Simulators have been developed to train pilots, sailors or car drivers without the costs and risks of moving their real vehicles. To obtain high success in training, the simulators have to provide a high level of realism. The requirements of simulators and their CIG-system, especially the 'real time' requirement, result from this need for realism. 'Real time' means, the system has to react in less than 150 ms after the trainnee has made an input.