code: public static void sendFeedback (DObject speakObj, String bundle, String message)
      {
          sendSystem(speakObj, bundle, message, SystemMessage.FEEDBACK);
      }
docs: Sends a system FEEDBACK message notification to the specified object with the supplied
  message content. A system message is one that will be rendered where the speak messages are
  rendered, but in a way that makes it clear that it is a message from the server.
  
  Feedback messages are sent in direct response to a user action, usually to indicate success
  or failure of the user's action.
  
  @param speakObj the object on which to deliver the message.
  @param bundle the name of the localization bundle that should be used to translate this
  system message prior to displaying it to the client.
  @param message the text of the message.