Recently I came to know about SHTML when I saw a site with .shtml extensions. What is the purpose of SHTML, and in what ways does it differ from HTML and DHTML?

Is there a simple script or piece of code I can add to my page to keep a log of every visitor, the date and time they hit the page and IP address? And what would be the best way to do this... java...

Typical scenario: DB items are displaied in page http://...?item_id=467 User one day deletes the item Google or a user attempts to access http://...?item_id=467 PHP diggs into DB and sees items ...