If the laptop is stolen, whenever the laptop has a connection to the internet, the chip contacts the intel AT servers, and the laptop will just completely shut down, rendering the entire machine unusable.
Intel are soon going to be releasing chips with built-in 3g cards so the laptops dont have to have a network connection in order to contact the intel servers.
It overloads the chip causing physical damage. This is a subscription based service which is addittional to the normal PGP licenses as the license is with Intel essentially