anchor.diff:                              UrlTiers, InfoHash, PeerId, TorrentId],
                             []).
   
  +%% @doc Prod the tracker and tell it we completed to torrent
  +%% @end
   -spec completed(pid()) -> ok.
   completed(Pid) ->
       gen_server:cast(Pid, completed).
   
   %%====================================================================
  -%% gen_server callbacks
  -%%====================================================================
  -
  -%%--------------------------------------------------------------------
  -%% Function: init(Args) -> {ok, State} |
  -%%                         {ok, State, Timeout} |
  -%%                         ignore               |
  -%%                         {stop, Reason}
  -%% Description: Initiates the server
  -%%--------------------------------------------------------------------
  +
  +%% @private
   init([ControlPid, UrlTiers, InfoHash, PeerId, TorrentId]) ->
       process_flag(trap_exit, true),
       HardRef = erlang:send_after(0, self(), hard_timeout),
  
positive.code: 
                  queued_message = started}}.
  
  %%--------------------------------------------------------------------
  %% Function: %% handle_call(Request, From, State) -> {reply, Reply, State} |
  %%                                      {reply, Reply, State, Timeout} |
  %%                                      {noreply, State} |
  %%                                      {noreply, State, Timeout} |
  %%                                      {stop, Reason, Reply, State} |
  %%                                      {stop, Reason, State}
  %% Description: Handling call messages
  %%--------------------------------------------------------------------
  handle_call(_Request, _From, State) ->
      Reply = ok,
      {reply, Reply, State}.
  
  %%--------------------------------------------------------------------
  %% Function: handle_cast(Msg, State) -> {noreply, State} |
  %%                                      {noreply, State, Timeout} |
  %%                                      {stop, Reason, State}
  %% Description: Handling cast messages
  %%---------------------------------------------------------------------
  handle_cast(completed, S) ->
      NS = contact_tracker(completed, S),
      {noreply, NS};
  
negative.code: -define(DEFAULT_TRACKER_OVERLOAD_INTERVAL, 300).
  -define(DEFAULT_REQUEST_TIMEOUT, 240).
  %%====================================================================
  
  %% @doc Start the server
  %% <p>Start the server. We are given a large amount of
  %% information. The `ControlPid' refers to the Pid of the controller
  %% process. The `UrlTiers' are a list of lists of string() parameters,
  %% each a URL. Next comes the `Infohash' as a binary(), the `PeerId'
  %% parameter and finally the `TorrentId': the identifier of the torrent.</p> 
  %% @end
  %% @todo What module, precisely do the control pid come from?
  -spec start_link(pid(), [tier()], binary(), integer(), integer()) ->
      ignore | {ok, pid()} | {error, term()}.
  start_link(ControlPid, UrlTiers, InfoHash, PeerId, TorrentId) ->
  