We update our web pages frequently. Our home page has almost always been changed within the last three days, as indicated by the "last revised" date at the bottom.
Please note that this particular page is
Most web browsers use disk caching to speed up your second access to files you have seen before. The page is saved on your hard disk or in memory of a machine. When you request it a second time by selecting a link you have used before, the file may come from the cache rather than being downloaded from the Internet. Ideally the browser checks to see if the page needs updating before it serves you a stale page. But not always. Most browsers will let you delete the cache, and you can usually configure your browser to do that automatically. If the cache is being saved by your internet service provider, we can't do much about that (see below).
In Internet Explorer you will find an option under Tools-Internet Options-General. In the Temporary Internet Files box, click on the Settings button. We use "every visit to the page" here. The Refresh button does not always work as advertised, and may continue to deliver the old page no matter what your settings are.
The reload button sometimes works as it should and gets the new page. There is a preference reached through Tools-Options. You have to search for Cache. In the Cached Web Content section the Clear Cache button deletes old files. You can also check to box for "Override automatic cache management and set your cache to 0 MB of space to prevent the problem from coming back.
In addition to your browser, some organizations or Internet Service Providers also cache or save web pages and supply them to the next one of their subscribers who tries to browse them as a way of saving Internet bandwidth and making the page load faster. AOL is a prime example. The page is saved on a disk or in memory of a machine within the organization. This permits many hits to be served from one occasional download of the page by the organization's server. Sometimes we have updated pages and had browsers complain that we have not. If your organization has a "proxy server" or another server that caches files, or if you are with AOL or another ISP who uses caching, you may well be seeing stale pages. Fast, efficient, but possibly stale. For some pages we do not update frequently, including this one, it will seldom matter, but for our WhatsNew page it can make a big difference. All of our pages have the Latest Update date at the bottom.
On some systems with caching, cached pages can be updated just by hitting your Reload or Refresh button. On others you may have to ask your system administrator how to update the cache.
If you suspect you are being victimized by cache problems, send us an email telling us which page is in question and we will confirm the date of our latest revision.