For most pages:
* Open the Tools menu in IE and choose Internet Options
* On the General tab, click the "Settings" button under Temporary Internet
files (about halfway down on the right).
* In the resulting dialog, set how often you'd like IE to check for newer
versions of pages. The less frequently you set this to happen, the more
frequently you'll get a cached version rather than checking for (and
probably downloading) a newer version of the page from the server.
* OK your way out of the dialogs.
Now, this will work for MOST pages, but web site authors and operators do
have the ability to set an expire time on their pages, and these will be
honored. For pages that change a lot (stocks, banking, airlines, etc), it's
likely that the page owners have set their pages with short expire times and
your browser setting most likely will not come in to play.
Hope this helps,
--Chris