Get going with Smart Documents
If you are looking for tutorials on how to get going with smart documents, I recommend the following articles, the second of which is brand new!
Article “The Definitive "Hello World" Managed Smart Document Tutorial” : https://msdn.microsoft.com/library/en-us/dnofftalk/html/office09042003.asp
Article: “Simple Sample of a Smart Document in Microsoft Office Word 2003” : https://msdn.microsoft.com/office/understanding/word/articles/default.aspx?pull=/library/en-us/odc_wd2003_ta/html/odc_wdsimplesd.asp