
A QR Code ("Quick Response" Code) is a mobile phone readable barcode
that's been big in Japan forever, broke into Eurpoe a while back, and is now getting
traction in USA.
In it's simplest sense think "print based hypertext link" - simply encode
a URL into the QR Code and then point a mobile phone (or other camera-enabled mobile)
at it. If the device has had QR Code decoding software installed on it, it will fire
up its browser and go straight to that URL.

mobile
version