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+UIDs on the Hurd are separate from processes.  A process has
+[[capabilities]] designating so-called UID vectors that
+are implemented by an [[auth]] server.  This
+makes them easily [[virtualizable]].
+
+When a process wishes to gain access to a resource provided by a third
+party (e.g., a file system) and that party wishes to authenticate the client
+so as to implement some identity-based access control ([[IBAC]]) policy,
+the latter initiates a three-way authentication handshake.  The server
+and client each then begin an authentication sequence with
+their respective [[trust]]ed auth servers.  If they have
+a mutally trusted ancestor and an auth server does not abort the
+transaction, then the client is delivered a new capability
+naming a newly authenticated session with the server
+and the server is delivered the client's designated UID vector.
+
+For more details, see section 2.3 of the [[HurdCritique]].