D.13. Calculator

D.12. Briefcase

Mac OS X doesn't have anything like the Briefcase, a Windows invention designed to help you keep your files in sync between a laptop and a desktop computer. On the other hand, if you sign up for a .Mac account (Chapter 19), you get a program called Backup that is similarly designed to keep folders synchronized between two machines. And you can use iSync (Chapter 19 also) to keep your calendar, addresses, and other items synched between multiple computers.