Yes, it gets updated in ubbt.inc.php.
You can't really have more than one script with the same name.
What I would do.....
That "other" index.php file..... rename it to something like index2.php
Then create an index.php file in that directory which looks like this:
<?
header("Location:http://www.yourdomain.com/whatever/index2.php");
?>
Then the old index.php will redirect nicely to index2 which is unique enough for who's online purposes and fairly transparent to the user.
