Acer Extensa 4100 - Manual (Page 34)

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Using a computer security lock
A security keylock notch, located on the rear of the computer, lets you
connect a Kensington-compatible computer security lock.
Wrap a computer security lock cable around an immovable object such
as a table or handle of a locked drawer. Insert the lock into the notch
and turn the key to secure the lock. Some keyless models are also
available.