they can both have parameters stashed in a table, and they both play
stuff out of the actor command list. Merge them; now the only
difference between playing and broadcasting a command is that playing
plays recursively on a tree and broadcasting sends to all subscribers.
The distinction between "messages" and "commands" is cosmetic now;
everything is a message. The only thing special about commands intended
to be received as a broadcast is the "Message" suffix, which subscribes it.
Glenn Maynard