Acer Aspire 5500 - 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 by using the emergency
eject hole (tray design drives only.)
Using a computer security lock
A security keylock notch, located on the chassis of the computer, lets you
connect a Kensington-compatible computer security lock.
Wrap the 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.