Is it possible to have two separate spreadsheets open in two distinct,
separate windows, each of which could be independently minimised to the
taskbar?

To clarify what I mean, in Word if you have two documents open, each is in
it's own Word window. I use two screens on my PC, and this allows me to have
one document open on each screen, and to minimise either one to view
something else. This is extremely useful when cross-referencing information.

I want to be able to do the same thing with Excel (using 2003, by the way).
I know that it is possible to stretch the Excel window across both screens
and have two separate sheets open but when it comes to minimising the whole
application goes, which is no use if I want to cross reference with another
application.

Is there some way I can configure Excel to do this?