How To: Use Your iPhone to Control Your Mac — Lock, Restart, Shut Down, Mute, Sleep, Browse Files, Play Audio & More
Your iPhone and Mac can speak to each other in many ways, allowing you to start work on one device and seamlessly switch to the other, share clipboards between the two, and pick up phone calls and answer text messages on both. The compatibility is incredible, but there's even more you can do by incorporating third-party software into the mix.
