4. The page title is ultimately set at the theme level. To let your PHPTemplate
   based theme interact with this module, you need to add some code to the template.php
   file that comes with your theme. If there is no template.php file, you can simply
   use the one included with this download. Here is the code:

function _phptemplate_variables($hook, $vars) {
  $vars = array();
  if ($hook == 'page') {

    // These are the only important lines
    if (module_exists('page_title')) {
      $vars['head_title'] = page_title_page_get_title();
    }

  }
  return $vars;
}

  As you can see from the code comment, there are only three important lines
  of code:

  if (module_exists('page_title')) {
    $vars['head_title'] = page_title_page_get_title();
  }

  These lines need to be added to the 'page' hook of the _phptemplate_variables
  function.

  Alternately, you can call page_title_page_get_title() from page.tpl.php
  directly at the place where the title tag is generated.