It would be better to handle it at the client. Just add a javascript 
on_submit routine to check a local JS varialble to determine if this is the 
second event ... if so cancel the form's sumit action. This way the server 
database is not queried.

In a message dated 10/30/00 2:23:43 PM Eastern Standard Time, 
[EMAIL PROTECTED] writes:

<< Since you are probably going to store the information from the form when
 they submit it the first time, why not add a flag field that identifies the
 action 'state' of a particular record. If each user is uniquely identifiable
 then just do a quick search on that identifier before inserting form data.
 If a record already exists for that particular id then disallow the new
 information. >>
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