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This looks like some good reference code for the trackback protocol.

“In this article we are going to cover how to trackback enable your site. There are several resources on the Web for implementing trackbacks in C#, but very few if any for doing this in VB.Net. Here we provide you with VB.Net code as a basis to build upon to implement trackback support into your portal or Web site.

What are Trackbacks?

Trackbacks are taken from popular blogging applications that allow your site to be notified when someone links to a page contained on your site. Developed by MovableType.org for their publishing system. Trackbacks and pingbacks (another method for site notification using XML-RPC), are growing fast in their use, and in the .Net development community in applications like .Text weblogs.

Here is an outline of the trackback notification process:

1. An external website is updated with a link to your site
2. Some process in the external site is notified of the new link and sends a request to your site to see if the page being linked contains information on where to send a trackback notification.
3. If the information is found, the external site contacts the trackback handler for your site to notify that a link has been added to the page.
4. Your trackback handler then verifies the existence of the link in the page and adds an entry to your trackback table.

http://www.wwwcoder.com/main/parentid/262/site/2344/68/default.aspx