A read-only property that returns a reference to the Windows collection.
expression.Windows
expression Required. An expression that returns a reference to the Application object.
0: Can be accessed without restrictions.
After you have set a reference to the Windows collection, you can use its properties to access each of the Window objects that it contains.
Note The Windows collection can be used only to get the count of the Window objects that it contains or to return a reference to a Window object. It cannot be used to add or remove Window objects.
In the following example, the Windows property is used to access the Count property of the Windows collection and display the value in a message box:
XDocument.UI.Alert("Count of Windows: " + Application.Windows.Count);