This subthread was about zdw&#x27;s option b) of Dropbox having to support both the OS protocol implementation and its own. In which case Dropbox would not control both sides of the protocol.<p>I think the protocol fairly complex and simultaneously underspecified (if by ZeroConf you mean mDNS and DNS-SD). Mash up multicast, DNS, dynamic DNS updates, and DNS-SD so that every node is running in effect both a DNS server and client... what could possibly go wrong ;)