The OpenSim Dispatcher defines a message-based, layered interface for interacting with an OpenSim region through external client applications. The messages provide an abstract API for an OpenSim scene including assets and objects, avatars, and events. By specifying the interaction in terms of messages (specifically JSON/BSON messages) the API is both language and transport independent. That means that you can write OpenSim applications in any language that can generate JSON/BSON messages. Further, concurrent processing of the messages ensures that high performance application requirements can be met such as those for real time object dynamics. Finally, all invocations must present a valid capability that can be generated solely