Hello:

I am interested in doing some simple programming in Excel 97. The
Help facility in Excel has plenty of examples of writing functions,
but does little to describe how to call a user-written function from a
spreadsheet.

For example:
I have defined a function such as:

Function CSR(NumberArg As Double) As Double
If NumberArg < 0 Then ' Evaluate argument.
Exit Function ' Exit to calling procedure.
Else
CSR = Sqr(NumberArg) ' Return square root.
End If
End Function

How do I call this from the worksheet? How do I refer to the Active
Cell?
(I've tried to call it by entering =CSRR() in a worksheet, but get a
#NAME error. I am not certain how to use the ActiveCell property to
refer to the passed value properly. I've tried it a number of ways
here to no avail.)

Where do I define this function in the the Visual Basic Editor?
(I've entered it in the General Declarations part of the workbook, and
it seems to 'compile' fine, but does not work!)

Thanks for your help,
Tom