Compaq Evo W8000 Hardware Reference Manual page 76

Security Lock Provisions
D-2
2. Insert the tang (tongue) of the narrow bracket into the slot on the
chassis, and slide the U-shaped security bracket between the tang
and the system unit cover. Next install the self-tapping screw
included in the cable lock kit.
3. Cover the screw with the flat bracket.
4. Install a lock (not provided) in the security bracket to control
access to the inside of the workstation. Install a cable lock (not
provided) to secure the workstation to a fixed object.
Compaq Evo Workstation W8000 Hardware Reference Guide