anchor.diff:  %
   % {{node, 'ns_1@foo.bar.com', port_servers}, ...}
   
  -get_port_server_config(PortName) ->
  -    get_port_server_config(ns_config:get(), PortName).
  -
  -get_port_server_config(Config, PortName) ->
  -    get_port_server_config(Config, PortName, node()).
  -
   get_port_server_config(Config, PortName, Node) ->
       case ns_config:search_prop_tuple(Config, {node, Node, port_servers},
                                        PortName, false) of
  
positive.code: 
  %% API
  -export([start_link/4, params/1,
           get_port_server_config/1,
           get_port_server_config/2,
           get_port_server_config/3,
           get_port_server_param/3,
           get_port_server_param/4,
           set_port_server_config/3,
           set_port_server_param/4,
           set_port_server_param/5,
           find_param/2,
           set_param/3]).
  
  %% gen_server callbacks
  -export([init/1,
  
negative.code:             {PortServerName, _Path, S, _Env} -> S
          end,
      find_param(ParameterName, StartArgs).
  
  set_port_server_param(Config, PortServerName, ParameterName, V, Node) ->
      {Path, StartArgs, Env} =
  