I have produced a form that will be used by other users and I would like to
think that when the user puts the cursor over a cell it pops up a text box
that explains what data is to be entered or explains the outcome

Maybe Insert|Comment when the user mouses over the cell

or use the data|validation prompt when the user selects the cell.

Or just use a nice column of adjacent cells that always shows the description.

Explanation boxes wrote:

I have produced a form that will be used by other users and I would like to
think that when the user puts the cursor over a cell it pops up a text box
that explains what data is to be entered or explains the outcome

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Dave Peterson