"The notebook computers introduce what's called a radio frequency technology indentification unit that you can think of as a two way transponder. There are sensor units available to go with this that are similar to the sensor units that you may have seen at department stores to prevent theft of articles from the store."
The notebooks can transmit their serial number and configuration. And if the wrong person walks off with it, it simply won't work. For existing notebook IBM is selling a new Smart Card Security Kit that plugs into a PCMCIA slot ...
"In order to be able to be able to power up the machine you have to have not only the machine but the smart card plugged into it and know the proper PIN number."
The kit sells for under two hundred dollars.