HRESULT TopicRemove(PCTSTR pszTopic);
Removes a topic from the set stored on the user's hard disk.
· Returns NOERROR if successful, or one of these error values:
E_INVALIDARG
E_OUTOFMEMORY
pszTopic
[in] Topic name. If this is NULL or an empty string the general topic, "General", will be used. If the topic does not exist then an error is returned.