Do I need canonical tags for index pages?

Since it appears that the index pages are duplicates of the original pages, do I need a canonical tag for one of them? How does Percussion handle these internally?

example - is the same as



I believe what is happening is that both and are in fact the same page and the web server is intelligent enough to serve the “index” page in the event that it is not entered as part of the URL. As such, you would not need canonical tags. If you had created a separate from, then I could see adding a canonical tag to one of those pages.  

OK, thanks Dan.