Following your example and the instructions in
http://support.microsoft.com/kb/213639 I put the following code into
"ThisWorkbook".

Private Sub Workbook_BeforeClose(Cancel As Boolean)
With Sheets("Sheet1")
arg1 = .Range("D5")
arg2 = .Range("E5")
End With
Shell ("d:\uty\setslope.exe " & arg1 & " " & arg2)
End Sub

When I close the file, nothing happens. Mt EXE doesn't run (I'd hear a beep if
it did) and there are no error messages. I'm in completely new territory here.
Please help further. Thanks.

--
- Vince