Two. Recent arrivals from the machine and then have to wait for orders from the command rm that the board is on the board then. Will need to declare the passengers boarding.
2. when the incoming passengers from all machines, and then must wait to hear commands from Rm whether to order Board at any Board order. Need to get more passenger announcements,
2. When the arrivals hall, and then have to wait for the end of listening to commands that will be ordered from Rm Board when where, when, and will have to go to order Board announced the launch passengers.