By any chance, might it be a Data Validation input message?

Try this:
Select the cell
From the Excel main menu:
<data<validation<input message tab

Does that help?
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Regards,
Ron

XL2002, WinXP


"Lance" wrote:

I'm working in a worksheet where some of the cells provide a pop-up window
that contains information about that cell. It's not a comments window.