static CWnd* GetClipboardOwner();
Retrieves the current owner of the Clipboard.
The Clipboard can still contain data even if the Clipboard is not currently owned.
Identifies the CWnd that owns the Clipboard. It is NULL if the Clipboard is not owned.
The returned pointer may be temporary and should not be stored for later use.
CWnd::GetClipboardViewer, ::GetClipboardOwner