This is a program for Windows based PCs. It is essentially, an e-book of the 2nd edition of the Avenger manual.Running the program, you can turn page by page on the screen, and print any page to a printer. The reason the manual is in this program form, is it takes up much less space, so the downlaod time is reduced. Very user friendly, better quality pages than you usually see offered on the web for these manuals.