Difference between CI session and PHP session

[eluser]gtech[/eluser]
[url="http://www.derekallard.com/blog/post/enhanced-codeigniter-session-library/"]http://www.derekallard.com/blog/post/enhanced-codeigniter-session-library/[/url]

I found this link on Derekallard.com where I think he answers your question if you look at the user comments after the 1st dark gray box.