anchor.diff:  
   %% gen_server.
   
  -init([UserId]) ->
  -	{ok, #state{id = UserId }, 5000}.
  +init([]) ->
  +	{ok, #state{}, 5000}.
   
   handle_call({set_user_info,UserInfo}, _From, State) ->
       #{ uid := Uid,
          uidNumber := UidNumber,
          gidNumber := GidNumber,
  -       homeDirectory := Dir
  +       homeDirectory := Dir,
  +       user_ids := UserIds
        } = UserInfo,
       NewState = State#state{ uid = Uid,
                               uidNumber = UidNumber,
                               gidNumber = GidNumber,
  -                            homeDirectory =Dir }, 
  +                            homeDirectory =Dir,
  +                            user_ids = UserIds
  +                          }, 
   
       {reply, ok, NewState};
   handle_call(get_user_info, _From, State) ->
       #state{ uid = Uid,
  -                            uidNumber = UidNumber,
  -                            gidNumber = GidNumber,
  -                            homeDirectory =Dir } = State, 
  +            uidNumber = UidNumber,
  +            gidNumber = GidNumber,
  +            homeDirectory =Dir,
  +            user_ids = UserIds
  +          } = State, 
   
       UserInfo = #{ uid => Uid,
          uidNumber => UidNumber,
          gidNumber => GidNumber,
  -       homeDirectory => Dir
  +       homeDirectory => Dir,
  +       user_ids => UserIds
        },
       {reply, {ok, UserInfo}, State};
   handle_call(get_credential_list, _From, #state{credentials=Creds}=State) ->
  
positive.code: handle_info({'DOWN', MonitorRef, process, _Object, _Info}, #state{sessions=Sessions}=State) ->
      NewSessions = remove_session_from_list(MonitorRef,Sessions),
      shutdown_if_done(NewSessions,State);
  handle_info(timeout, #state{id = Id} = State) ->
      ok = tts_user_mgr:user_wants_to_shutdown(Id),
      {noreply,State,5000};
  handle_info(_Info, State) ->
  	{noreply, State}.
  
negative.code: -include("tts.hrl").
  
  %% API.
  -export([start_link/0]).
  -export([set_user_info/2]).
  -export([get_user_info/1]).
  -export([get_credential_list/1]).
  