HP DC367B - Compaq Basic Port Replicator 1.2 Reference Manual page 20

Using the Docking Station
4. With the lock and key in the unlocked position and with the
T-bar on the back of the lock in the vertical position, insert
the lock into the center groove in the cable lock slot in the
docking station 1.
5. Insert the cable into the recessed cable channel in the base
of the docking station 2.
3–4 Reference Guide