[sclitheroe]

@MickMcGeough:

Found it:

A Kensington Security Slot on the rear of the Horizontal Docking Station not only safeguards the dock, but also adds a layer of physical security to the computer, previously unavailable to the users of the newest MacBook models. After installing a Kensington Lock,the MacBook can be locked in place with a password.
Until the lock is removed or the correct password is entered,the undock function is locked out, securing the MacBook.

http://hengedocks.com/downloads/heng...ontal_dock.pdf