Comments: The automotive quick reference guides offered by CarleySoftware are easy to use, very helpful and perfect for the home mechanic, entry level automotive technician or student technician. The software is available on CDs or downloads. for Windows PCs and laptops. I blught the Everything CD which includes all of their products, plus a HUGE library of tech articles and reference files that I found to be very helpful in understanding how to diagnose and repair all kinds of car problems. Great value for the money!