If your application - is tightly integrated with IE then you may opt for ATL/WTL based application.(this will give high performance) - is a standalone application and IE plugin, then activex control. - needs just the url or some simple information...MFC SDI should will do good. If you are intrested only in MFC, then choose MFC document server. You want both MFC windowing and ATL, then add ATL component to MFC SDI project. Let us know where your application falls in ??? Thanks, Ramu