I have a bill payment web site which has a payment information form 
(credit card number, expiration date, etc...) on a page which stays 
displayed after the user clicks "Submit Payment". The confirmation page is 
not shown until the transaction has completed which may take as long as 
10- seconds. I am having trouble with users clicking a second time and 
submitting two payments.

I am assuming that I could just redirect the browser to the "Please 
wait...." page while the credit card processes the request, but how will 
that page know that the credit card process is done and send the browser 
to the confirmation page? I know that a lot of sites do this, but can't 
figure out how it works. I am using Java servlet technology.



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