Next Frame moves the
time slider ahead one frame.
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Status bar > Time controls > (Next Frame)
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Status bar > Time controls > Turn on
(Key Mode Toggle). > (Next Key)
If Key Mode is on, the time slider moves to the next keyframe. Keyframe options are set in the Key Steps group of the
Time Configuration dialog.
If Time Configuration dialog 
Use TrackBar is on, Next Key jumps to the next key of any kind. If Use TrackBar is off, Next Key jumps to the next transform key, ignoring any other type of keys.