anchor.diff:  handle_call(stop,_From,State) ->
       {stop, normal, ok, State};
   
  -handle_call({force_sync,_RemoteManagers},_From, State) ->
  -    ok = sync(),
  +handle_call({force_sync, ClusterId, RemoteManagers},_From, State) ->
  +    Mgrs = [#cluster_manager{node = N,
  +                             cluster_id = ClusterId}
  +            || N <- RemoteManagers],
  +    ok = exec(Mgrs),
       {reply, ok, State}.
   
   
  
positive.code: heartbeat() ->
      gen_server:cast(?MODULE, heartbeat).
  
  force_sync(RemoteManagers) ->
      ?debugVal(RemoteManagers),
      gen_server:call(?MODULE, {force_sync, RemoteManagers}).
  
  
  %%--------------------------------------------------------------------
  
negative.code: -export([start_link/0,
           stop/0]).
  -export([heartbeat/0,
           force_sync/2
          ]).
  
  %% gen_server callbacks
  