Review on Secure Your Laptop with the Kensington Portable Laptop Combination Cable Lock - Letter Combination Lock (K64684US) by Balthazar Cooper

If you're cruising for hours on public transit or moving from hotel to hotel, this cable lock can come in handy to prevent nimble fingers from stealing your laptop, but worse, it's gone with years of data. The cable is designed to wrap around a fixed fixture (rail, pipe, fixture) and the lock fits into a "security slot" found on most laptops. It is no problem to pry the lock out of the groove or out of the attachment point. So it's a visual deterrent to accidental theft, but nothing more. When I'm in a hotel, I either lock my laptop in the room safe