In this distribution: phptagengine.class.inc.php The PHP class definition of PHP Tag Engine, this contains the core code. phptagengine.config.inc.php Put your config settings in here. phptagengine.css Make things look pretty here. phptagengine.inc.php Include this file in your project, in turn it includes the rest of the PHP Tag Engine files and handles AJAX requests. phptagengine.php.js AJAX communication code. languages/* Put your translations here. yui/* Yahoo! Auto-Complete library code. README.txt this file See http://phptagengine.com/ for more information.