TRINIX

This comes in handy, when you want to use specific files.
I listed a couple of possibilities.

JavaScript Import:

<script
   type='text/javascript'
   src='directory/file.js'>
</script>

CSS:

<style type='text/css'  media='all'>
   @import 'directory/file.css';
</style>

Icon Import:

<link
   rel='Shortcut Icon'
   href='directory/file.ico'
   type='image/x-icon'>

PHP Import:

<?php @ require_once ('directory/file.html'); ?>

Adding an extra @ will prevent for possible errors to be shown.