Handoff is a major element of Apple's "integration" theme, and of the new Continuity feature set for iOS 8 and OS X Yosemite, which also includes cross-compatible AirDrop, iPhone call and SMS handling on the iPad and Mac, and the new, much easier to connect, tethering service. Rather than trying to fit one interface across a range of different devices, or making the cloud the center of the universe, Apple is promising to transparently, seamlessly move whatever activity you're doing to whatever device you want to continue doing it with. It's a person-centric choice and a bold one, but if Apple delivers, it could forever change the way we use our iPhones, iPads, and Macs.