Acer 4150 Series - Manual (Page 25)

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Ejecting the optical (CD or DVD)
drive tray
To eject the optical drive tray when the computer is turned on, press
the drive eject button.
When the power is off, you can eject the drive tray using the
mechanical eject hole.
Using a computer security lock
A security keylock notch, located on the left hand side 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.