Here is classic problem with User Defined Function in Excel. How do you solve the problem of letting user know what to input in a UDF, how many arguments, what argument do what, any optional argument, etc.?
I read it somewhere that to have a tooltip for UDF is not easy. What about some kind of help that will pop up when we invoke the UDF, or anything that will hint user when they use the function at the first instance in a Excel section.
Any idea will help.