@cwebber Thanks for the response. Both the original paper and Wikipedia state: "Everything is an actor". Not in AP. In response to messages, actors can create other actors and only modify their own *internal* state. Not specified in AP. Another difference is that AP actors can communicate to other actors without actor addresses (using "as:Public"). Interestingly, an "inbox" (or message queue) is not required in the Actor Model of Computation (see paper). Too many differences to list here...