Using The Security Lock - IBM ThinkPad 755CX Manual

Protecting Your Computer and Internal Devices

Using the Security Lock

To prevent your computer from being removed without permission,
purchase a Kensington lock or a compatible lock and attach it to the
keyhole on the side of the computer; then secure the chain on the
lock to a stationary object.
This also prevents the keyboard from opening and secures the
internal devices under the keyboard.
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Chapter 5. Protecting Your Computer