InfoPath Dev

Hi, I have two listboxes on a brower-enabled InfoPath form. I'd like to use buttons (e.g. Add, Remove) to copy values from listbox #1 to listbox #2 and vice versa, and I'd like to retain the values in each listbox after the form is closed and reopened. Is there a way to do all of that on a browser-enabled form? Thank you.

Hello,  I have two dropdown listboxes on my InfoPath form.  The values in listbox #2 are determined by the selection in listbox #1. Thanks to forums like this one, I found a way to make this work.  I bound an XML file to listbox #2 as a secondary data source and programmatically populate listbox #2. My question is ...