Before After Window in PSCS3

Howdy Everyone,

I was watching a retouching video, I think called Pixel Perfect with Bert Monroy.

In this video he did something but didn't say how as it was not part of what he was teaching but I think it would be very useful.

He opened a "new window" which shows the same file he was working on.

As he made corrections at 200% and 400% the "new window" stayed at 100% but showed his changes live so he could keep up with how the image looked as he progressed thru his corrections.

Basically it was a live "before/after" type thing.

He was doing this on a Mac with PS CS3. How would I do this with a windows machine using PS CS3? I used the CS3 Help feature but didn't find it.

Thanks
--
Lundy

'Sometimes the best part of wanting something is not having it.' ME 1994

http://www.pbase.com/lundy