What is the difference between a Kensington and Dell security cable?

Kensington Simple Solutions Combination Laptop Lock for Standard Security Slot, Resettable Anti-Theft 4-Digit Combination K-Slot Security Cable Lock

Designed to provide a simple locking solution for laptops without security slots, the locking My laptop has no Kensington lock slot, I

kensington nano security slot™ secure their company or personal laptop with the Multplx Laptop combi locking cable, or any existing standard T-BarKensington lock cable

kensington nano security slot It would seem that Kensington has identified the lack of a lock slot on ultrabooks and the like They have a solution: Security Slot Adapter