Описание тега shdocvw
MSDN
Shdocvw.dll turn hosts the Mshtml.dll component, as well as any other Active Document component (such as a Microsoft Office application) that can be loaded in place in the browser when the user navigates to a specific document type.
Shdocvw.dll supplies the functionality associated with navigation, in-place linking, favorites and history management, and PICS support. This DLL also exposes interfaces to its host to allow it to be hosted separately as an ActiveX control. The Shdocvw.dll component is more frequently referred to as the WebBrowser Control.
Internet Explorer
ShDocVw.dll provides the navigation, local caching and history functionalities for the browser.
Wine
shdocvw.dll provides API to view OLE documents. It is in fact the main DLL of Internet Explorer. Its most common use is WebBrowser control.
WebBrowser control allows an application to embed different documents. It is mostly used for HTML documents. WebBrowser checks the type of the document, creates its instance and views it. Note that HTML rendering has nothing to do with WebBrowser control, but it's done by the document object embedded in WebBrowser.
Further Information Links