Please Scan My Towel: How I turned my hotel towel into my RSA conference badge

From the manufacturer of the tags:

Target Applications

  * Electronic ticketing in public transport    
  * Road tolling    
  * Airline tickets    
  * Access control    
  * Multiple applications

Do these have additional security features that the badge didn't use?

It says "how" but it doesn't actually provide any technical details at all.

Like the punch line at the end. :)