There's a Duplicate command on one of the menus, Image I think (I'm not at my imaging computer right now). Then tile the 2 windows as you like.
Peter
Thanks. Yes, I'm aware of that. Works OK with a portrait frame, but a landscape frame takes quite a bit of tweaking to get them sized. In LR it's just a click of a button.
Jeremy, the reason is that you can do final soft proof editing for print with a large image open.
e.g. With a final edited image open, choose Image/Duplicate and size them so that they're side by side on the sceen.
Now choose View/Proof Setup/Cutom and choose the paper profile for the paper type you're using. The active image will now change due to the affect of the profile. Now you can toggle through the Rendering Intents in the same dialog and see which one most approximates the master image (the inactive window).
Finally, you can make final adjustments to the active window to make it look identical to the master image.
Then you can print it safe in the knowledge that you will get exactly what you're seeing on the screen.
It is brainless that this is not possible in LR's Print Module.
In his excellent book Adobe Photoshop CS4 for Photographers, Martin Evening goes into this in some detail.
You can read it here>
http://books.google.ie/books?id=crkuo7fwM4...;q=&f=falseD.