Continuity

Need BT LE (4.0, Bluetooth low energy, aka iBeacons) on (for proxmity detection?), on same Wi-Fi network (auto adhoc too?) + each device connected on same iCloud account

Handoff, AirDrop, Instant Hotspot, Universal Clipboard

Unlock with iWatch use Time-of-Flight (802.11ac Wi-Fi) instead

Apple's Cloud (iCloud) checks the user has permission to access the file, Bluetooth 4.0 (iBeacon) detects when devices are nearby, and Wi-Fi Direct (AirDrop) sends files high-speed over a secure peer-to-peer Wi-Fi connection.

Handoff passes only enough information between the devices to describe the activity itself, while larger-scale data synchronization is handled through iCloud.

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