InfoPath Dev

Can an expression box in one form be used to count empty text boxes from a repeating table in another form? If yes, please explain the steps!

What exactly do you mean by "another form"?  Another view?  Another XML file somewhere on your network or the internet?  The answer to the former is a lot easier than the answer to the latter.

I am already successfully doing it from another view but I am interested in doing that from another infopath form = from a different document library on the same SharePoint site. So yes, Its an XML.