Hi - Thanks! This is the solution I actually realized myself last night, after many hours of looking at the other solutions and finding problems with them. Thanks to everyone who responded! - Mark

Richard Lynch wrote:
On Mon, December 4, 2006 3:03 pm, Mark London wrote:
Is there any way for PHP to know whether it is being called due to a
browser refresh versus a mouse click?  I think the answer is no but I
just want to be sure.  Thanks.

You could embed a random token in all your links and input forms, and
if they re-use a token, then you know they are re-loading something
they have seen at some time in the past.

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