When the user submits a message to PageGate, they are given a response webpage indicating the success or failure of their request. In either case, on the response webpage an option 'Back to Message Form' is given. This normally returns the user to the webpage form. By setting the variable BACK_REF in the webpage, you can specify another webpage to return to rather than the form just used.
Example: (this text would be included in the web page)