Good morning, Excel gurus!

I have a spreadsheet where I have protected the workbook and worksheet
except for the input fields.

I have one cell that I would like to use as a "approved by" cell. I would
like all users to enter the data in the other "unprotected" cells. But this
one cell I would like password protect. Can I use a different password than
the worksheet pswd? If not, that's OK - just asking.

So, what I would like is when you tab to that cell, you get a password
prompt? Only the CFO (and me) will know the password - so when his initials
are in the box, we know he "approved" the file.

Bonus question, after he "initials" the cell, can I lock the entire sheet?

This is a cheap version of a "digital signature" :-)

Thanks a bunch!