What is a Kensington Lock?

Security Slot Specifications kensington security slot The ClickSafe® Universal Combination Laptop Lock fits any laptop security slot — standard T-bar kensington nano security slot Buy Kensington Security Slot Adapter Kit for Ultrabook featuring Adds Kensington Security Slot, Adhesive Attachment, Works with All T-Bar Locks

kensington lock slot use Nobody wants their prized setup nicked And the industry provides the Kensington lock to stop this happening But does anyone use it at all?