14. The non-transitory computer readable medium of claim 13 , wherein to accumulate the short-term shared knowledge about the current conversation, the computer-executable instructions are further operable when executed to populate a short-term context stack with information about the utterance received during the current conversation.
14. The non-transitory computer readable medium of claim 13 , wherein to accumulate the short-term shared knowledge about the current conversation, the computer-executable instructions are further operable when executed to populate a short-term context stack with information about the utterance received during the current conversation. 15. The non-transitory computer readable medium of claim 14 , wherein to accumulate the short-term shared knowledge about the current conversation, the computer-executable instructions are further operable when executed to expire the information about the utterance from the short-term context stack after a psychologically appropriate amount of time.