It's an Excel setting. Go menu Tools Options and select "windows in
taskbar".

HTH. Best wishes Harald

"LW" skrev i melding
...
For some reason, when I crashed out of Excel one time, I lost the
capability
of toggling between workbooks in one Excel session. I can still do this
for
powerpoint, word, etc, but cannot for excel. It's very frustrating
becuase I
used this feature quite often.

I can open another session of Excel but when I have to move or copy
worksheets from one workbook to another I can't. I hope someone can help
me
with this! Maybe it's an Excel problem or a Windows problem?