BOOL OpenClipboard();
Opens the Clipboard. Other applications will not be able to modify the Clipboard until the CloseClipboard Windows function is called.
The current CWnd object will not become the owner of the Clipboard until the EmptyClipboard Windows function is called.
TRUE if the Clipboard is opened via CWnd, or FALSE if another application or window has the Clipboard opened.
::CloseClipboard, ::EmptyClipboard, ::OpenClipboard