Some people would like to create a page which is external to SMF, and does not use a custom action, but still displays the theme header and footer.

The following code will display the forum's header and footers, as well as a full forum page initiation (all variables, etc) but will allow you to include your own content in the middle.

<?php
 require_once('/path/to/SSI.php');
 template_html_above();
  template_body_above();
  
 echo '
   <hr />
   This would be the content sections of the page
   <hr />
   ';
  
   template_body_below();
  template_html_below();
    
 ?>