MSI CX420 User Manual page 67

3-22
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Quick Launch [Fn] Buttons
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User Defined
Enable or disable the touchpad function.
Decrease the LCD brightness.
+
Increase the LCD brightness.
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Decrease the built-in speaker's volume.
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Increase the built-in speaker's volume.
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Disable the computer's audio function.
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Force the computer into sleep mode (depending on the system
configuration).
Press and hold the Fn button, and then press the F4 button to
launch the User Defined application.