Samsung PL64E8000GFXZP - Manual (Page 627)

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Using the Mute function
– If you press and hold the Touch Pad,
it has same effect as pressing the
MUTE M button on your remote.
– However, if you press and hold the
touch pad when using Web Browser ,
the Touch Pad switches to the Scroll
mode. When you press the Touch
Pad again, the Scroll mode switches
general mode.