****DO NOT USE****
Dishonest practice of quietly spamming users of your site with an online casino link at the top of your sites pages.
Version.php - has the link code.
inuse.php - checks the inuse.txt text file to see if the IP address has accessed the site, so only NEW users get the link.. makes it harder to find the offending spam
inuse.txt keeps a list of the IP address.
If you know what you are doing in PHP you can edit these nastiness out... but given the amount of plugins out there, just get one from a decent honest developer rather than some hack happy underhand low life :/