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Just like an HTML page you can return another page to indicate that the server has recieved your message. If you are doing this from a browser then an HTML page can be returned. If you are in a standalone Reader/Acrobat then the HTML page will not be interpretted. You can however send back a PDF page.
This will not stop the user from hitting submit multiple times. You can hide the real submit button, and put up a regular button (that look slike a submit to the user) and have it press the real submit for you, then lock the button so that the user cannot press it again.
Hope that helps
Paul