anchor.diff:      gen_server:call(name(Context), get_modules_status).
   
   
  +%% @doc Return the pid of a running module
  +whereis(Module, Context) ->
  +    gen_server:call(name(Context), {whereis, Module}).
  +
  +
   %% @doc Return the list of all modules in the database.
   %% @spec all(#context{}) -> [ atom() ]
   all(Context) ->
  
positive.code: %% @doc Return all running modules and their status
  handle_call(get_modules_status, _From, State) ->
      {reply, z_supervisor:which_children(State#state.sup), State};
  
  %% @doc Trap unknown calls
  handle_call(Message, _From, State) ->
  
negative.code:     active_dir/1,
      get_modules/1,
      get_modules_status/1,
      whereis/2,
      all/1,
      scan/1,
      prio/1,
  