HP 6 - Manual (Page 54)

2 How to Install Accessories In Your PC
Installing a Security Cable
42 English
Installing a Security Cable
You can secure the PC to your desk, or any other fixed object, using a
Kensington security cable. The PC has a slot at the rear for securing
the cable.
1 Insert the lock into the slot located at the rear of the PC.
2 Turn the key to lock the cable to the PC.
3 Remove the key and store it in a safe place.
NOTE The Kensington security cable is not an HP accessory. It cannot be
ordered from HP. Contact your reseller for more information.