C / C++ / MFC

MSHTML::IHTMLDocument2Ptr spDoc(m_ctlWeb1.GetDocument());
if (spDoc)
{
    IDispatchPtr spDisp(spDoc->GetScript());
    if (spDisp)
    {
        OLECHAR FAR* szMember = L"Populate";
        DISPID dispid;

        HRESULT hr = spDisp->GetIDsOfNames(IID_NULL, &szMember, 1, LOCALE_SYSTEM_DEFAULT, &dispid);
        if (SUCCEEDED(hr)) // found function
        {
            COleVariant vtResult;
            static BYTE params[] = VTS_BSTR;

            COleDispatchDriver dispDriver(spDisp);

            dispDriver.InvokeHelper(dispid, DISPATCH_METHOD, VT_VARIANT, (void*)&vtResult, params, strXML);

            BOOL bSuccess = vtResult.boolVal;
        }
    }
}

// create on page load to stop expensive load and unload of the XML Document COM object
var oXmlDoc = new ActiveXObject("MSXML2.DOMDocument.4.0");
function Populate(strXML)
{
   bSuccess = false;
   // create an xml document to load the XML into
   if (oXmlDoc)
   {
       oXmlDoc.async = false;
       oXmlDoc.resolveExternals = false;
       if (oXmlDoc.loadXML(strXML))
       {
           // success, now parse to see what we need to update
           var oNode = oXmlDoc.selectSingleNode("/update/field");
           if (oNode)
           {
               // get the element in the page
               var elField = document.getElementById("idField");
               if (elField) elField.innerText = oNode.innerText;
               bSuccess = true;
           }
       }
   }
   return bSuccess;
}