You could use session variables to do this, or just a cookie.
Regardless, make sure your Application.cfm file is enabling
Sessions if you want to use them.
Don't worry about CFID and CFTOKEN. Just set some flag in the
action page of the form, and check for it with an isDefined
before you display the form. If it's found, bump the user to
an alternate page with your once-per-session-only message.
This is kind of OT, so email me privately if you need further
assistance.
-Erik
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