e e tao facil....

Procter & Gamble is placing radio-frequency identification tags on products at a Metro Extra retail store in Germany so that when a customer pulls the product off the shelf, a digital screen at eye level changes its message. When a consumer picks out a shampoo for a particular type of hair, for instance, the screen recommends the most appropriate conditioner or other hair products, says John Paulson, president of G2 Interactive, a digital-marketing arm of WPP Group's G2 Network.

http://brief-do-lombo.blogspot.com/2008/09/minority-report-live.html