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Meta tags are easy to use, but aren’t very effective. That’s because they’re only honored by a few browser caches (which actually read the HTML), not proxy caches (which almost never read the HTML in the document). While it may be tempting to put a Pragma: no-cache meta tag into a Web page, it won’t necessarily cause it to be kept fresh.
Here's example ASP code from ASPFAQ [classicasp.aspfaq.com]
Response.ExpiresAbsolute = #2000-01-01#
Response.AddHeader "pragma", "no-cache"
Response.AddHeader "cache-control", "private, no-cache, must-revalidate"