What you may be looking for is the "submitForm" method which gives you a huge option of parameters to pass, the most important including the url to submit to and the format (XML, PDF etc.). It is detailed in the scripting reference for Acrobat. You can use it in Designer provided that you refer to the Acroform doc object as "event.target" as opposed to "this", ie "event.target.submitForm({..parameters..})". You can put this script in the click or mouse up event of a button.