PS CS5 Exposure options in RAW

Working in Camera RAW I recently discovered an option for exposure adjustment that shows highlight clipping and I need more information

On a PC, while adjusting the exposure slider, if you hold down the Alt key the image display shows the highlight clipping in various colors.

I don't understand exactly what the Alt function actually does or if there are any other key functions available for exposure [or other adjustments].

So far Adobe Help is more useless than I ever remember it being.

Where can I find help with settings like this and others?
LVL 10
Al JeeAsked:
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Al JeeAuthor Commented:
Quick and dirty!!
I like it!

Thanks <dbrunton>!
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