In the last session a demo showed the use of a RazCode that was read by Microsoft Tag Reader.
Google uses QR Codes. An equivalent two dimensional scan code.
If you use the Google Link Shortener http://goo.gl and add a .qr to the end of the short code you get an instant unique QR scan code.
For example to go to https://sites.google.com/site/healthcampfoundation/ you could use the short url: http://goo.gl/KEj0
You can get the QR code shown above by using the url http://goo.gl/KEj0.qr