<META HTTP-EQUIV="Expires" CONTENT="0">

Preventing the document from being cached ensures that a fresh copy of the document will always be retrieved from the site, even during the user's current session, regardless of how the user has set the browser's caching options. This is useful if the content of the document changes frequently.

You should be aware that this technique is often annoying, because the user needs to wait for the entire page to load each time.

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