Sony VAIO VPCY21 SERIES - Manual (Page 39)

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Using Your VAIO Computer >
Using Special-function Buttons
Using Special-function Buttons
Your computer is equipped with special buttons to help you use specific functions of the computer.
Special-function button Functions
ASSIST button
Launches the VAIO Care while the computer is on.
While the computer is off, the ASSIST button launches the VAIO Care Rescue.
!
Do not press the ASSIST button while the computer is in Hibernate mode.
VAIO button
Launches the Media Gallery or turns the volume on and off, depending on your model.