In addition to using Ajax, you could also set the target of the form to "_blank", causing the form to submit to a new window or tab.
<form target="_blank" name="input" action="html_form_action.asp" method="post" id="formID">
The browser can open as many windows as you let it so you could go on for a while.
This would be incredibly annoying to a user though. I hope you know what you're doing.
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