Can someone explain to me what the history state slider does?

Hi everyone!
Why use the slider when I can easily click a previous state from the list in the history panel?
Does the slider have some extra function that I may have overlooked?
Thanks for your help,
It's been bugging me for ages.
Kelly
(using Photoshop CS5.1)

I had to boot my old XP machine to fire up CS5 and remind myself of this feature. It's called the Active State Marker and merely shows the currently active history state. Some documentation indicates you move this slider to another history state to make it active. By why bother; just click a history state to make it active. This slider is no longer available in CS6 or CC because -- as you indicate -- it doesn't do anything useful.

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