And if you look at the titlebar, do you see things like:
book1.xls:1
and
book1.xls:2
If you do, then it's not really two instances of excel and it's not even two
versions of your workbook. It's two (at least) windows looking at the same
workbook.
You can close one of these windows by clicking on the window you don't want then
hitting ctrl-w.
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