To secure the computer, in a public environment, such as a café, airport, or library, wrap one end of the security cable around a heavy, immobile object. Insert the lock into the Kensington slot on the computer and secure the lock with its key or its combination.

Kensington provides different lines of locks for different needs. Where a student, while working in a library, might need one level of security, a person who travels frequently or an IT manager responsible for hundreds of pieces of equipment might need more security. In general, there are two basic lock types: combination padlocks and keyed locks. With a combination lock, you will need to remember a sequence of numbers to unlock the security device. With a key lock, you will need to keep track of a set of keys that belong to the security device.

Kensington type locks are the standard for security in the world of notebooks. Their cables are difficult to cut, and prying the lock out of the case will leave obvious signs of damage to the notebook that would make it difficult for any thief to resell the computer to any reputable business or individual.

No security system is ever perfect. Never disclose the combination of your lock to people that you do not trust. Never give the keys to someone that you do not trust. Never leave a notebook unattended for long periods of time in a public place, even if you have secured it with a Kensington lock.