No more than two people can log in at the same time. Up to now, only two people can log in at the same time. If there are more than two people, he will kick each other down by force. So far, there can only be more than one person at most, which means that only two people are allowed at most. If more than two people, such as a third person, log in at the same time, then the random one will be squeezed out.