Compaq Armada M300 Series Reference Manual page 67

5
chapter
Security features are available on some models of the mobile
expansion unit.
A security cable slot helps protect the system from theft. Use a
security cable, purchased from a Compaq authorized reseller
worldwide, and loop it around the object to be secured. Pull the
lock through the cable loop and insert the cable into the slot on the
mobile expansion unit. If the cable has a key, use it to lock and
unlock the cable.