>How about this! If I use a CGI driven banner rotation and a CGI driven text rotation on the main info I want to frequently update, Will they see this? >Or will visitors still only see the text and banner in their cached copy?
they will see only what their browser settings specify, OR what's in the cache at their ISP (that's another wild-card ... ISPs cache pages, and their reload schedule may be date-driven instead of content-driven, and they can ignore anything you request them to do. It's their hardware, they program it.)