Citation:
META HTTP-EQUIV="pragma" CONTENT="nocache"
This tag tells browsers such as Netscape Navigator and Microsoft Internet Explorer not to store a copy of your page in the cache on your hard drive. The cache is normally used to store recent pages that you have visited, so that the browser doesn't have to go off to the server to download commonly-visited pages all the time. However, if you are updating the page frequently and want users to see the newest version at all times, then use this META tag.
Sur Google, mots clés : content nocache
La dernière phrase te donne une utilité de cette balise. ;)