#433 Run a VBA macro when certain cells change in Excel

When you type an entry in cells A1:C10 on Sheet1, a message box is displayed.
In the module sheet behind Sheet1 add this script

Private Sub Worksheet_Change(ByVal Target As Range)
    Dim KeyCells As Range

' The variable KeyCells contains the cells that will
    ' cause an alert when they are changed.
    Set KeyCells = Range("A1:C10")

If Not Application.Intersect(KeyCells, Range(Target.Address)) _
           Is Nothing Then

' Display a message when one of the designated cells has been 
        ' changed.
        ' Place your code here.
        MsgBox "Cell " & Target.Address & " has changed."

End If
End Sub