drupal/modules/help.module

<?php

function help_module($name) {
  if (module_hook($name, "help")) {
    print "<H2><A NAME=\"$name\">". ucfirst($name) ." module</A></H2>";
    print module_invoke($name, "help");
  }
}

function help_admin() {
   module_iterate("help_module");
}

?>