DNS & BIND Here are the changes from the 5/98 reprint: (21) changed all the ".qb"s to ".qc" (22) both figures: same change as on previous page (420) added the following to the next-to-last para.: Whenever possible, our books use RepKover (tm), a durable and flexible lay-flat binding. If the page count exceeds RepKover's limit, perfect binding is used.