Tag was, of course, Microsoft's version of the QR code. It used color pixels, which meant it could encode more information in the same space.<p><a href="http://en.wikipedia.org/wiki/Microsoft_Tag" rel="nofollow">http://en.wikipedia.org/wiki/Microsoft_Tag</a><p>Unfortunately, the way it's designed, every barcode is just an ID number that points at a Microsoft server, which then forwards the client to the actual URL. Once these servers shut down, every Tag code ever used will break forever.<p>Which is great. Pretty funny joke Microsoft is playing on whoever made the mistake of using their products.