anchor.diff:      [clique:register_config(Key , fun config_callback/2) || Key <- Keys],
       clique:register_config_whitelist(Keys, ?APP).
   
  -config_callback([_, "listener"], Value) ->
  -    {ok, {_, Env}} = application:get_env(?APP, listener),
  -    application:set_env(?APP, listener, {Value, Env}),
  -    " successfully\n";
   config_callback([_, Key], Value) ->
       application:set_env(?APP, list_to_atom(Key), Value),
       " successfully\n";
  
positive.code:     [clique:register_formatter(cuttlefish_variable:tokenize(Key), 
       fun formatter_callback/2) || Key <- keys() -- Ignore].
  
  formatter_callback([_, "listener"], {Port, _Params}) ->
      Port;
  formatter_callback([_, "listener", Key], {_Port, Params}) ->
      proplists:get_value(list_to_atom(Key), Params);
  formatter_callback([_, "default_user", Key], Params) ->
  
negative.code:      "stomp.frame.max_headers",
       "stomp.frame.max_header_length",
       "stomp.frame.max_body_length",
       "stomp.listener.acceptors",
       "stomp.listener.max_clients"].