Normally when a user clicks on the back button, the browser will display a cached version of the page and will not request a fresh copy from the server. This behavior changes when your original page contains an 'Expires' HTTP header tag, or if you have added a <meta http-equiv="pragma" content="nocache"> tag in the HTML header.
Sent by Richard Whittlesey on 02/22/2004 08:39:48 PM:
How do I prevent a page from being resent when a user goes back to the same cached page. Thanks