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Simulation is by now considered an essential activity prior to the implementation of complex, embedded real-time systems such as automotive control units. However, the models required for a meaningful systems simulation are often heterogeneous -(such as software, hardware, hydraulics, mechanics etc.) and developed in parallel using different tools from different vendors, thereby making comprehensive system simulations very hard. An open architecture for cosimulation of heterogeneous systems and its first implementation within the MATRIXx tool family, based on the Common Object Request Broker Architecture (CORBA) is described. It allows plug-and-play cosimulations between a wide range of simulation tools and can serve as the foundation of sophisticated virtual prototyping and systems simulation activities.