The Index property returns the index number of a window in a Windows collection.
Examples:
The following VBA example displays the caption for each window in the Windows collection of the active document.
Sub Test()
Dim Wnd As Window
Dim s As String
For Each Wnd In ActiveDocument.Windows
s = s & Wnd.Index & " - " & Wnd.Caption & vbCr
Next Wnd
MsgBox "The current document contains the following windows: " & vbCr & s
Set Wnd = Nothing
End Sub