text: After Publisher has a pointer to the**IMsoDocExporter**interface, it calls back the add-in 
  
  through the methods exposed by**IMsoDocExporter**. Through these callbacks, Word 
  
  provides the add-in with document content and other information about the document. 
  
  An excellent source of information about building COM add-ins for Microsoft Office 
  
  applications is the codeproject.com article Building an Office2K COM Add-in with 
  
  VC++/ATL  . 