Back and Fwd work much like a browser’s Back and Forward, except that they apply only to the files displayed in the topic pane; the browser’s Back button might well move out of OmniHelp altogether, returning to the previous URL. (If OmniHelp is loaded in its own window, usually there are no browser buttons). If Back is clicked for the first OmniHelp file displayed, or Fwd is clicked without previously clicking Back, nothing happens.