Re EXCEL97 under WinXP-Pro w/SR-2

Microsoft Windows allows you to easily toggle between applications using
Alt-Tab. Is there a similar key board to toggle between two open
workbooks in Excel?  One can use Alt-W to display list of open
workbooks, but you can’t just blinding hit the up or down arrow, because
the most recently accessed workbook is not always at the top or bottom.

I realize that I could get around the problem of opening two copies of
Excel and then toggling using the Alt-Tab keys, but typically I’ve got
two workbooks open in one copy of Excel before I realize I need the
feature.  Thus, I’m looking for a more direct process.