When hosting the webbrowser control directly, autocomplete works just fine. When hosting the mshtml control directly, autocomplete does not seem to work. Anyone have an idea on what the host needs to do to get the mshtml control to use autocomplete on forms. I have set the host's IDocHostUIHandler's DocHostFlags to DOCHOSTUIFLAG_ENABLE_FORMS_AUTOCOMPLETE and also fooled with OptionKeyPath, but haven't gotten anywhere. Another option might be to subclass the edit window in the document, implement my own autocomplete object, and use SHAutoComplete on the edit window. That seems like overkill though. Any help is appreciated. Thanks.