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encyclo - 2:22 am on Jan 17, 2006 (gmt 0)
How to set up caching depends on your server software. Are you running Apache, IIS or something different?
If you are using static pages then the server will automatically configure the caching for the page in relation to the last modified date on the file - so if you leave the page unchanged for four weeks, many servers will instruct caches and browsers to keep a copy of the page for an amount of time which will vary between several hours and several days.