Multiple Window Support in Silverlight 5

So much talks about Multiple Window support in Silverlight 5 which made available in beta version around various Silverlight blogs and forums.I am putting my few thoughts here on this feature.
The basic idea behind this feature is host stuff across multiple windows,remember the good old days of MDI forms in Visual Basic 6 days? well its not I will say replica of but its of similar kinds.
The bookish meaning of Multiple Window support is :
The ability to create an application that can have additional top level windows other than the single window that's opened for a Silverlight Out of Browser application
Game starts with namespace System.Windows.Window and it looks like following :
#region Assembly System.Windows.dll, v4.0.30319
// C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\Silverlight\v5.0\System.Windows.dll
#endregion
using System;
using System.ComponentModel; ...