code: protected boolean postMessage (DownstreamMessage msg, PresentsConnection expect)
      {
          PresentsConnection conn = getConnection();
  
          // make sure that the connection they expect us to be using is the one we're using; there
          // are circumstances were sufficient delay between request and response gives the client
          // time to drop their original connection and establish a new one, opening the door to
          // major confusion
          if (expect != null && conn != expect) {
              return false;
          }
  
          if (_compound != null) {
              _compound.msgs.add(msg);
              return true;
          }
  
          // make sure we have a connection at all
          if (conn != null) {
              conn.postMessage(msg);
              _messagesOut++; // count 'em up!
              return true;
          }
  
          // don't log dropped messages unless we're dropping a lot of them (meaning something is
          // still queueing messages up for this dead client even though it shouldn't be)
          if (++_messagesDropped % 50 == 0) {
              log.warning("Dropping many messages?", "client", this,
                  "count", _messagesDropped, "msg", msg);
          }
  
          // make darned sure we don't have any remaining subscriptions
          if (_subscrips.size() > 0) {
  //             log.warning("Clearing stale subscriptions", "client", this,
  //                         "subscrips", _subscrips.size());
              clearSubscrips(_messagesDropped > 10);
          }
          return false;
      }
docs: Queues a message for delivery to the client.