With recent releases of affordable hardware devices the fields of Virtual, Mixed, and Augmented Reality gained considerable attention, wherefore the creation of corresponding software becomes increasingly important. In the absence of a common model for flexibly combining and reusing appropriate software modules, such Realtime Interactive Systems are commonly implemented from scratch. Borrowing from the fields of Software Engineering and Knowledge Representation, this work develops a model for the creation of reusable components from existing software modules. With a Knowledge Representation Layer at its core the model additionally enables the utilization of methods from the field of Artificial Intelligence, thereby supporting the creation of Intelligent Realtime Interactive Systems.