Agents can distinguish messages that are intended for them by checking
the <team-identifier> and <target> fields. An agent A
listens to a message from a member of the same team that is targeted
to A, to the entire team, or to some subset of the team that
includes A. All other
messages may be ignored, or since all team members know the
locker-room agreement, agents may use these messages to monitor their
teammates' internal states.