Enables apps to obtain the window handleof the window (CoreWindow) associated with this interface.
The ICoreWindowInterop interface has these methods.
|ICoreWindowInterop::get_WindowHandle||Obtains the handle (HWND) to the CoreWindow for an app.|
|ICoreWindowInterop::put_MessageHandled||Sets whether or not the message to the CoreWindow has been handled.|
Windows Store apps can have multiple CoreWindow instances. Each CoreWindow instances also has a native interface for accessing the underlying HWND, represented as an instance of ICoreWindowInterop.