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Should I use either of these tags:
<meta http-equiv="refresh" ...
<meta http-equiv="expires" ...
or something else?
I'm guessing that you mean for the new content to be displayed to the user when they revisit your page (as opposed to the content changing during their visit).
In that case, the expires is that way to go, although a server setting is the most effective way of achieving this - although on hosted boxes this is not an option a lot of the time.