Word Namespace Classes for Extending the Office Object Model with VSTO
The Microsoft.Office.Tools.Word namespace contains classes that represent objects in the Word object model. Here is a list of the class names, along with their descriptions, that you can use in VSTO to extend the Office Object Model:
Document: Document class represents the document in Word 2010.
Bookmark: Bookmark control represents the bookmark class from the Word object model. The bookmark control has a unique name, exposes events, and can be bound to data as well.