anchor.diff:  -spec last_msg_sent(state()) -> erlang:timestamp().
   last_msg_sent(State) -> element(14, State).
   -spec set_last_msg_sent(state()) -> state().
  -set_last_msg_sent(State) -> setelement(14, State, erlang:now()).
  +set_last_msg_sent(State) -> setelement(14, State, os:timestamp()).
   
   -spec start_idle_check() -> ok.
   start_idle_check() ->
  
positive.code: %% @copyright 2007-2012 Zuse Institute Berlin
  
  %   Licensed under the Apache License, Version 2.0 (the "License");
  %   you may not use this file except in compliance with the License.
  
negative.code:     end;
  
  on({web_debug_info, Requestor}, State) ->
      Now = os:timestamp(),
      LastMsgSent = last_msg_sent(State),
      SecondsAgo =
          case LastMsgSent of
  