I know this is do-able, as I've seen it before. I just don't know how to do
it. What I'm trying to do is create an excel spreadsheet for vacations here
at work, where the cells will automatically fill in with a pre-determined
fill/background color when the text letter "V" (for vacation day) is entered
in the cell. It would also be neat to know if another letter, say "S" (for
planned sick/doctors appointment) would work the same way and the cell change
a different color when an employee entered "S".

All I'm trying to do is to highlight the background fill color of cells
automatically when a specific letter is typed into a cell. Thanks very much
in advance for any help you can give here.