MSI GT640 User Manual page 32

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5. Touchpad
This is a pointing device of the notebook.
6. Quick Launch Touch Sensors
Touch the quick launch touch sensors to activate the specific applications or tools.
With the help of these touch sensors, users will be able to do work more efficiently.
Webcam
Wireless LAN: Glowing blue when wireless LAN function is enabled.
Scroll Lock: Glowing blue when the Scroll Lock function is activated.
Caps Lock: Glowing blue when the Caps Lock function is activated.
Num Lock: Glowing blue when the Num Lock function is activated.
Hard Disk/ Optical Drive Device In-use:
Blinking blue when the system is accessing the hard disk drive or the
optical drive device.
Touch this sensor to activate the Webcam function.