And the answer is not complicated but it's one which I don't want to go through here, other than to say that the communication systems for doing this are really pretty well understood.
답은 복잡하지는 않지만 여기서 얘기하고 싶지는 않구요, 통신시스템이 이런 일을 하는데 꽤 잘 작용합니다.