I"m surprised that you don't know what TWAIN is.  Didn't you ever read Huckleberry Hound or Tom Sawyer when you were growing up?  Or was it Finn?  No, I think Finn was the cartoon and Hound was the book.  Although now that I think of it, I thought he wrote that stuff at least 20 or 30 years ago so you would think that the technology he developed would be obsolete by now.