A nice plug for Absolute Software in Engadget (original article at http://gigaom.com/2005/06/27/lojack-for-your-laptop/)
Absolute Software licensed the name LoJack to make a LoJack-like system for your portable. The software installs a silent agent into the machine’s BIOS which sends a IP address or phone number upon Internet connection to help identify its physical location in case it should “go missing�.
