Distributed Interactive Protocols (DIS) promise that any simulator "speaking" the protocol can link up to a network without major modification. This paper will consider this premise in the light of a case study of connecting the E2C Part Task Trainer to Simnet. We postulate that, although some changes do need to connect to a distributed network, they can be catagorized and organized to independent software which can interface to the network and minimize disturbance to the simulator. We hope that this study can guide future conversion efforts to distributed simulation.