24. The system according to claim 1 , further comprising an extension and modification facility configured to: enable behavior associated with the agent architecture to be configured via one or more speech interface commands or one or more inputs to a graphical user interface; and enable behavior associated with one or more of the plurality of domain agents to be configured via the one or more speech interface commands or the one or more inputs to the graphical user interface.
26. The system according to claim 24 , wherein the extension and modification facility includes a generic agent that the one or more speech interface commands or the one or more inputs to the graphical user interface can use to create a new domain agent to add to the agent architecture and configure the behavior associated therewith.