code: protected void establishClockDelta (long now)
      {
          if (_comm != null) {
              // create a new delta calculator and start the process
              _dcalc = new DeltaCalculator();
              PingRequest req = new PingRequest();
              _comm.postMessage(req);
              _dcalc.sentPing(req);
              _lastSync = now;
          }
      }
docs: Called during initialization to initiate a sequence of ping/pong messages which will be used
  to determine (with "good enough" accuracy) the difference between the client clock and the
  server clock so that we can later interpret server timestamps.