code: public static void showHelpTopic(String module, String topic, String label) {
          getShell().getHelpViewer();
          HelpUtil.show(module, topic, label);
      }
docs: Shows help topic in help viewer.
  
  @param module The id of the help module.
  @param topic The id of the desired topic.
  @param label The label to display for the topic.