+val get_users : unit -> string list
+
+val create_session : string -> session_id
+
+val get_session_owner : session_id -> string
+
+val get_status : session_id -> MatitaEngine.status
+
+val get_history : session_id -> MatitaEngine.status list
+
+val get_commit_priv : session_id -> bool
+
+val probe_commit_priv : session_id -> unit
+
+val set_status : session_id -> MatitaEngine.status -> unit
+
+val set_history : session_id -> MatitaEngine.status list -> unit
+
+val logout_user : session_id -> unit