10. A system for managing a message communication system comprising: providing a token log comprising a data structure that contains a user-extensible set of tokens and implied conditions under which specific tokens are considered valid; means for creating a new token comprising a set of symbols that together have no prior functional meaning within the message communication system; means for storing the new token in the token log together with information that implies one or more conditions under which the token is considered valid, which validity information implies one or more specific actions to be performed when a message accompanied by the new token experiences an event; means for distributing the new token to one or more external entities; means for changing a validity status of the token; means for receiving an incoming message with the new token attached; means for determining the validity status of the new token by attempting to locate the token in the token log and checking the one or more conditions for use; and means for rejecting the message if the new token was determined to no longer be valid.
10. A system for managing a message communication system comprising: providing a token log comprising a data structure that contains a user-extensible set of tokens and implied conditions under which specific tokens are considered valid; means for creating a new token comprising a set of symbols that together have no prior functional meaning within the message communication system; means for storing the new token in the token log together with information that implies one or more conditions under which the token is considered valid, which validity information implies one or more specific actions to be performed when a message accompanied by the new token experiences an event; means for distributing the new token to one or more external entities; means for changing a validity status of the token; means for receiving an incoming message with the new token attached; means for determining the validity status of the new token by attempting to locate the token in the token log and checking the one or more conditions for use; and means for rejecting the message if the new token was determined to no longer be valid. 15. The system of claim 10 , wherein the one or more conditions under which the token is considered valid includes that the token is still recorded in the token log at the time an incoming message with the specific token attached is received.