It supports interaction between different machines used by a single user, as well as between users that share data. As with more traditional systems, the servers are trusted not to leak information. However, the r le servers play is not as much the hub in the system. In particular, users are in charge of delegating acccess to files.
Users can delegate access rights to local and remote users, including remote users in other domains.
In essence, we have realized a flexible infrastructure where users can implement their own security policy.