There are a couple of ways, one not too robust, one that requires a dll.

The not too robust way, suggested by Laurent Longre and working for two
parameters is :-
Const Lib = """c:\windows\system\user32.dl*l"""
Option Base 1


Private Function Multiply(N1 As Double, N2 As Double) As Double
Multiply = N1 * N2
End Function


'=============================*=============


Private Function Divide(N1 As Double, N2 As Double) As Double
Divide = N1 / N2
End Function


'=============================*=============


Sub Auto_open()


Register "DIVIDE", 3, "Numerator,Divisor", 1, "Division", _
"Divides two numbers", """Numerator"",""Divisor """, "CharPrevA"
Register "MULTIPLY", 3, "Number1,Number2", 1, "Multiplication", _
"Multiplies two numbers", """First number"",""Second number """, _
"CharNextA"


End Sub


'=============================*=============


Sub Register(FunctionName As String, NbArgs As Integer, _
Args As String, MacroType As Integer, Category As String, _
Descr As String, DescrArgs As String, FLib As String)


Application.ExecuteExcel4Macro _
"REGISTER(" & Lib & ",""" & FLib & """,""" & String(NbArgs, "P") _
& """,""" & FunctionName & """,""" & Args & """," & MacroType _
& ",""" & Category & """,,,""" & Descr & """," & DescrArgs & ")"


End Sub


'=============================*=============


Sub Auto_close()


Dim FName, FLib
Dim I As Integer
FName = Array("DIVIDE", "MULTIPLY")
FLib = Array("CharPrevA", "CharNextA")
For I = 1 To 2
With Application
.ExecuteExcel4Macro "UNREGISTER(" & FName(I) & ")"
.ExecuteExcel4Macro "REGISTER(" & Lib & _
",""CharPrevA"",""P"",""" & FName(I) & """,,0)"
.ExecuteExcel4Macro "UNREGISTER(" & FName(I) & ")"
End With
Next


End Sub




The dll solution:
Also from Laurent Longre, you use the FUNCUSTOMIZE utility .Get it at
http://longre.free.fr/english/

--

HTH

RP
(remove nothere from the email address if mailing direct)


"Davids" wrote in message
...
Hi all!

I work with Excel functions and I want write descpription for the function
and for its parameter (like the Excel's Sum() function).
For the function I use:

public function myFunct(p1 as string) as string
Attribute myFunct.vb_Description="Description of myFunct"
' ...

myFunct = "Hello!"
end function

How it's possible to write the description for p1?

Thanx in advance!

Davids