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How does an Multitouch overlay works? Answered

i'm a electronics enthusiast and would like to find out the technology behind such stuff.
they both say it works bad outside...so its probably Infrared based...
I was wondering if it is with some IR Leds and phototransistors or some kind?
examples:
http://mesamundi.com/collections/multitouch-overlays
http://peauproductions.com/store/index.php?main_page=index&cPath=29_85

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thank you for your time, i was looking at a paper from an university that was explaining almost the same process.

so this seems a really trivial tecnology...ideas