Are you running apache? If so, you can try adding a prepend line to the .htaccess
Code:
php_value auto_prepend_file /path/prepend.php
This should cause every page to load that file prior to processing any of the information on the pages (put the code at the beginning of the page).
You can also put it at the bottom by using
Code:
php_value auto_append_file /path/append.php
It might be easier / cheaper to do that, rather than spend $200 on some script.