>>Forgive me for asking stupid questions, but what can you do with that hWnd handle?
>
>You can use it for any Win32 API function that requires a window handle. As an example, GetWindowText() would require a window handle. Check the MSDN for "Window Functions" under the Platform SDK treeview node.

One thing that immediately comes to mind would be to use LockWindowUpdate() to keep an ActiveX control from updating. Assuming that the control doesn't expose a window handle property or function, having the form's window handle easily accessible gives you a good starting for FindWindowEx() to locate the control's.