The NYU bookstore will introduce and demonstrate its new Espresso Book Machine, used for printing on-demand books, at a question-and-answer session Wednesday, July 18 at 6 p.m. At the push of a button, the machine prints, binds and trims professional-quality books. Light refreshments will be served at the event. More information can be obtained by calling the book store's trade book department at (212) 995-3530.