Chances are that you use at least one computer or computer-related device on a daily basis. Some are obvious: for example, the personal computer on your desk or at your school, the laptop, the PDA that may be in your briefcase. Other devices may be a bit less obvious: the “smart” cell phone, the iPod, a digital camera, and other essentially specialized computers, communications systems, and data storage systems. Finally, there are the “hidden” computers found in so many of today’s consumer products—such as the ones that provide stability control, braking assistance, and navigation in newer cars.