Mm, I did read the page source - on a Mac, the page links to a .sit file, which automatically downloads (rather than opens in the browser); and on Windows, it links to a mysteriously named file 'shakespeare.pdf-link.pdf' or 'shakespeare.html-link.html' &c. The part before the hyphen is the real filename, and what follows, just a 'link'.
So yes, I suppose, that must be serverside. Damn, I guess I'll have to wait a while before I figure it out.