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i give up.
Go and get a system that does what you want, and see how it manages it.
phpBB is usually a good one to checkout, as it usually handles all of this stuff at some point.
if the data is being sent to a database, then check to see if it already exists..
Else, write the data to a cookie, and when the page gets loaded (whether refreshed or submitted to) check it to see if the data is in the cookie.. If it is, then the page is not what you want if it isn't, then you want it to go ahead.
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