anchor.diff:  
   %% -------------------------------------------------------------------
   
  +%% @hidden
   handle_call(_, _From, State) ->
       {reply, invalid, State}.
   
   %% -------------------------------------------------------------------
   
  +%% @hidden
   handle_cast({client_request, _Client, _Id, _Request} = Message, State) ->
   	[FirstWorker | OtherWorkers] = State#state.worker_pids,
   	gen_server:cast(FirstWorker, Message),
  
positive.code: 
  %% -------------------------------------------------------------------
  
  handle_info(_, State) ->
      {noreply, State}.
  
  %% -------------------------------------------------------------------
  
  terminate(Reason, _State) ->
  	?info("Terminating due to ~p.", [Reason]),
  	ok.
  
  code_change(_OldVersion, State, _Extra) ->
  	{reply, State}.
  
negative.code: %% @doc Dictates the background content loaded by the client, and
  %% dispatches events for entities in a given zone. (?)
  
  % FIXME: This module should not actually be used! It's a useful example of
  % how to build a channel, though.
  
  -module(pre_channel_entity).
  -behavior(gen_server).
  