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The framework calls this member function for each window in the Clipboard-viewer chain when the contents of the Clipboard change.
Only applications that have joined the Clipboard-viewer chain by calling the SetClipboardViewer member function need to respond to this call.
Each window that receives an OnDrawClipboard call should call the SendMessage Windows function to pass a WM_DRAWCLIPBOARD message on to the next window in the Clipboard-viewer chain. The handle of the next window is returned by the SetClipboardViewer member function; it may be modified in response to an OnChangeCbChain member function call.