Hi,
You could use the worksheet change event. Right click your sheet tab, view
code and paste this in
Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Cells.Count > 1 Or IsEmpty(Target) Then Exit Sub
If Target.Address = "$A$1" Then
If IsNumeric(Target) Then
On Error Resume Next
Application.EnableEvents = False
If Target.Value > Range("B1").Value Then
'do your thing
End If
Application.EnableEvents = True
On Error GoTo 0
End If
End If
End Sub
Now if A1 changes to a value greater than B1 you can run some code.
Mike