code: public static void generate(ConfigurationImpl configuration) throws DocFileIOException {
          DocPath filename = DocPaths.overviewSummary(configuration.frames);
          PackageIndexWriter packgen = new PackageIndexWriter(configuration, filename);
          packgen.buildPackageIndexFile("doclet.Window_Overview_Summary", true);
      }
docs: Generate the package index page for the right-hand frame.
  
  @param configuration the current configuration of the doclet.
  @throws DocFileIOException if there is a problem generating the package index page