anchor.diff:  
   -compile(export_all).
   
  --record(mbox, {addr, pid}).
  --record(dmgr, {curr % A dict of all the currently active, alive mboxes.
  -               }).
  +% We have one MBox per Addr.
  +%
  +-record(mbox, {addr, pid, started}).
  +
  +% A dict of all the currently active, alive mboxes.
  +-record(dmgr, {curr}).
   
   %% API for downstream manager service.
   %%
  
positive.code: 
  start_mbox(Addr) ->
      case start_link(Addr) of
          {ok, Pid} -> {ok, #mbox{addr = Addr, pid = Pid}};
          Error     -> Error
      end.
  
  %% Child/worker process implementation, where we have one child/worker
  %% process per downstream Addr or MBox.  Note, this can be a
  %% child/worker in a supervision tree.
  
  start_link(Addr) ->
      Location = mc_addr:location(Addr),
  
negative.code: 
  monitor(Addr) ->
      case gen_server:call(?MODULE, {pid, Addr}) of
          {ok, MBoxPid} -> monitor_mbox(MBoxPid);
          Error         -> Error
      end.
  
  monitor_mbox(MBoxPid) when is_pid(MBoxPid) ->
      {ok, erlang:monitor(process, MBoxPid)}.
  
  demonitor(undefined)   -> ok;
  demonitor(MonitorRefs) ->
  