None = EmptyClipboard()
The EmptyClipboard function empties
the clipboard and frees handles to data in the clipboard. The function then
assigns ownership of the clipboard to the window that currently has the
clipboard open.
Comments
Before calling EmptyClipboard, an application must open the
clipboard by using the OpenClipboard function. If the application
specifies a NULL window handle when opening the clipboard, EmptyClipboard
succeeds but sets the clipboard owner to NULL.
Win32 API References
Search for EmptyClipboard at msdn, google or google groups.
Return Value
If the function succeeds, the return value is None.
If the function fails, win32api.error is raised with the GetLastError
info.