Opening a second copy of a document (OS X)

[kylebellamy]

I've been looking for a way in Photoshop to open a copy of the document I'm currently working on. I can do this in other programs but can't seem to find a way to do it in Photoshop short of saving the document under another name and re-opening the old one. Any shortcut keys or some such thing?

http://www.kylebellamy.com

 

[Frankie48]

In PS, go to Image...Duplicate. This immediately opens the same image in a new window as a copy.