This page has a special HTML tag that tells (some) browsers that they shouldn't put the page into cache. It is useful if you have a page that changes frequently, like every few minutes. View the HTML source for the page to see how to use this tag.
Note that this tag only advises the browser to avoid caching the HTML page, it does not tell the browser to avoid caching the graphics that may be referenced on the page. If you access the Web through a proxy server, as many large companies do, it is also possible that the proxy server caches pages and graphics in a way that is beyond the control of either the browser or the server. In other words, this isn't perfect.