If you want this procedure to run automatically when you start Excel, you can make it into an Auto_Open macro and place it in your Personal.xls file.
Sample Macro
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'Runs the Change_Font sub procedure whenever you open a new
'window or switch to another book.
Sub Auto_Open()
Application.OnWindow = "Change_Font"
End Sub
'This procedure will run each time a new window is displayed.
Sub Change_Font()
'If the active sheet is a worksheet or macro sheet then
'ask the user if they want to change the Normal style font.
If TypeName(ActiveSheet) = "Worksheet" Then
response = MsgBox("Do you want to change the Normal style?", 1)
'If user chooses Cancel, then stop the procedure.
If response = vbCancel Then End
'If user chooses OK, then display the Fonts dialog box.
Application.Dialogs(xlDialogStandardFont).Show
End If
End Sub
'Discontinues the OnWindow function when the book containing the
'subroutines is closed.
Sub Auto_Close()
Application.OnWindow = ""
End Sub