The New Window command does give you a second window into the *same*
document, and the Compare command then uses both windows in the same
document. If you then want to look at different parts of the document in
the
two windows, click the Synchronous Scrolling button on the floating
toolbar
to turn it off.

Try it, you'll like it. :-)

Ahhhhh, gotcha!

I didn't understand that you could open a second window (with Window New
Window) for the *same* document. Now that's sunk in I've got it working :-)

I was wondering how Word would deal with edits on one window, but of course
it just updates the second window.

Great feature! And thanks for your help.