// Error checking omitted for clarity
CComPtr<IOleObject> spOleObj;

// Create WebBrowser--store pointer in class member variable m_spWebBrowser
CoCreateInstance(CLSID_WebBrowser, NULL, CLSCTX_INPROC, IID_IWebBrowser2, (void**)&m_spWebBrowser);

// Query WebBrowser for IOleObject pointer
m_spWebBrowser->QueryInterface(IID_IOleObject, (void**)&spOleObj);

// Set client site
spOleObj->SetClientSite(this);

// In-place activate the WebBrowser control
RECT rcClient
GetClientRect(&rcClient);
spOleObj->DoVerb(OLEIVERB_INPLACEACTIVATE, NULL, this, 0, GetTopLevelWindow(), &rcClient);

// Register container to intercept WebBrowser events
AtlAdvise(m_spWebBrowser, GetUnknown(), DIID_DWebBrowserEvents2, &m_dwCookie);

// Navigate to start page
m_spWebBrowser->Navigate(L"res://webhost.exe/startpage.htm", NULL, NULL, NULL, NULL);