What does UPI stand for?

MLA style: "UPI." Acronym Finder . 2013. AcronymFinder.com 21 May. 2013 http://www.acronymfinder.com/User-Program-Interface-(UPI).html
Chicago style: Acronym Finder . S.v. "UPI." Retrieved May 21 2013 from http://www.acronymfinder.com/User-Program-Interface-(UPI).html
APA style: UPI. (n.d.) Acronym Finder. (2013). Retrieved May 21 2013 from http://www.acronymfinder.com/User-Program-Interface-(UPI).html

User Program Interface

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