Do you know how to use Conditional Formatting?
If no, there're a bunch of resources on the web, so just google it with the keywords "excel 2003 coditional formatting".
UDF stands for User Defined Function, that is a custom function created by using VBA code.
The UDF below returns TRUE if the target cell contains Formula.
First of all, to use this UDF, open VBA editor by hitting ALT+F11.
Next, insert a Standard Module (ALT+I, M) and paste the code.
Now you can use the UDF just like pre-defined worksheet functions.
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