Sony VAIO VGN-CR - Manual (Page 33)

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Using Your VAIO Computer
Play/Pause button
Starts or pauses playback of a CD or DVD media or a music/video file stored on the hard disk drive.
Stop button
Stops playback of a CD or DVD media or a music/video file stored on the hard disk drive.
Previous track button
Plays the previous chapter/file during video playback or the previous song/file during audio playback.
Next track button
Plays the next chapter/file during video playback or the next song/file during audio playback.
Special-function button Functions