There is the server and the client, which is also kind of sexual in connotation... In any case, that was the old way of, what we call, a singlecast. Now, with multicast, it can be configured in IPv6 in any which way like this. This forms, what we call, a, interestingly, promiscuous -- which is a technical term, I promise you -- a promiscuous configuration where people relate, like gossips, what they hear from each other.