BOOL ChangeClipboardChain( HWND hWndNext );
hWndNext
Identifies the window that follows CWnd in the Clipboard-viewer chain.
Removes CWnd from the chain of Clipboard viewers and makes the window specified by hWndNext the descendant of the CWnd ancestor in the chain.
TRUE if CWnd is removed; otherwise FALSE.
CWnd::SetClipboardViewer, ::ChangeClipboardChain