anchor.diff:  %% API
   -export([start_link/0,
            stop/0]).
  --export([heartbeat/0]).
  +-export([heartbeat/0,
  +         force_sync/0
  +        ]).
   
   %% gen_server callbacks
   -export([init/1,
  
positive.code: 
  
  handle_call(stop,_From,State) ->
      {stop, normal, ok, State}.
  
  
  %% Function: handle_cast(Msg, State) -> {noreply, State}          |
  
negative.code:         true ->
              void;
          false ->
              sync()
      end,
  
      defer_heartbeat(Interval),
  