Obviously there's a lot of stuff to do with using this that has emerged in the course of the comment thread. Hopefully some kind and technically adept soul will come up with a comprehensive tutorial for nurks like moi.
I seem to gather that the entire content of the book has to fit on one line. Does this set a limit of length on that content? I always assumed the books in Uru were only a couple of pages long because they didn't think we'd have the patience to read any more (fools)or, in the alternative, that they didn't have the patience to write any more...