Asus Transformer Pad TF303 E-Manual page 114

Remote Link presentation controller
Tap to control the presentation slides on your computer.
Remote Link Windows® Media Player controller
Tap to control the Windows® Media player.
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Chapter 9: ZenLink
Tap this button to go to next slide.
Tap this button to go back to previous slide.
Tap this button to go back to previous song/music file.
Move this slider to minimize/maximize the volume.
Tap this button to go to next song/music file.
Move this seeking button to select a part of a song/music file
that you want to listen or play.