ATLOpenInNewIEWindow

m_spWebBrowser2->put_StatusBar(VARIANT_TRUE);
                        m_spWebBrowser2->put_ToolBar(VARIANT_TRUE);
                        m_spWebBrowser2->put_MenuBar(VARIANT_TRUE);
                        m_spWebBrowser2->put_Visible(VARIANT_TRUE);
                                            
                        char surl[] = "http://www.csdn.net/";
                        CComVariant vaURL( ( CComBSTR) surl);
                        VARIANT vtFlags;
                        vtFlags.vt = VT_I4;
                        vtFlags.lVal = navOpenInNewWindow;

                        m_spWebBrowser2->Navigate2( &vaURL,&vtFlags ,
                        NULL,
                        NULL,
                        NULL
                        );

vtFlags.vt = VT_I4;
vtFlags.lVal = navOpenInNewWindow;

关键是这2个参数。