the prefix that is going to be common to all receive-symbols. if omitted, the blank symbol will be used (thus no prefix). the suffix of each receive symbol that will be registered. list of symbols to register receive-symbols for. they will be prefixed. sending such a message unregisters all previous receive-symbols registered by this box (which may be reregistered immediately... if this is what you're doing) the message received the receive-symbol that this message was received as. =