Thanks Gord, but that's not really what I meant. That would just give me a
gray highlight rather than a colored highlight on the printed result.
An example of what I want to do is to color certain cells, say, green. When
one of my employees uses my excel model, she will know that all input
variables are highlighted in green, and that she is free to change the values
in these cells. She will also know not to make any changes to cells that
aren't green, because those cells contain formulas or constants.
Our clients don't see the excel model -- they only see the printed results.
The distinction between variables, constants and formulas is not important to
our clients, only to me and my employees. Consequently, I don't want anything
showing up on the printed results that indicates the distinction.
In short, I want a shorthand visual means (in this case, color-coding) of
communicating something only to the excel user and not to the person viewing
the printed results.