anchor.diff:                    [Node, AddrId, Key, Clock, Reason]),
               enqueue(AddrId, Key)
       end,
  -    erlang:send(Pid, Ret).
  +    erlang:send(Pid, {Ref, Ret}).
   
   
   %% @doc Insert a message into the queue
  
positive.code:              {ok, reference()} | {error, reference(),  any()}).
  repair(#read_parameter{quorum = ReadQuorum,
                         req_id = ReqId}, Redundancies, Metadata, Callback) ->
      From   = self(),
      AddrId = Metadata#?METADATA.addr_id,
      Key    = Metadata#?METADATA.key,
  
negative.code: %%--------------------------------------------------------------------
  %% @doc Compare local-metadata with remote-metadata
  %% @private
  -spec(compare(reference(), pid(), pid(), atom(), #state{}) ->
               ok).
  compare(Ref, Pid, RPCKey, Node, #state{metadata = #?METADATA{addr_id = AddrId,
                                                               key     = Key,
                                                               clock   = Clock}}) ->
      Ret = case rpc:nb_yield(RPCKey, ?DEF_REQ_TIMEOUT) of
                {value, {ok, #?METADATA{clock = RemoteClock}}} when Clock == RemoteClock ->
                    ok;
  