I looked up one of these a while back when I was looking up information on how SMTP servers work.., for a program..
http://www.faqs.org/rfcs/index.html
I had no idea that there were so much of them, if you ever wanted to know how the internet works.., this would be the place to start.., I have read a few of them.., they can be really confusing.., have to reread stuff sometimes but its definately really interesting..
