Apple OS X Yosemite is the newest iteration in the line of operating systems being launched by Apple which will integrate your Mac, iPad and iPhones. Once users have all their devices registered in the same iCloud account, all machines know what the others are doing. Macs can be used as speakerphones, answering and making calls. A document started on an iPad can be picked up on a Mac at just the point the user left off on the iPad , and vice versa. The same facility exists for almost any file – a video edited in iMovie, a book read in iBooks, a slide show in iPhoto. Perhaps most excitingly for some, your iPhone's ability to take calls and receive SMS messages is also extended to your Mac if you're on the same Wi-Fi network for both. If you wear a headset with a microphone while using a Mac, this is a brilliant feature as you can just take the call and keep working. Meanwhile the Messages app on iOS and OS X have been built with each other in mind, so you can continue text conversations across both. With a free update to OS X, Apple has added a significant amount of value not just to its Mac systems but also to its mobile devices, be they the shiny new iPad Air 2 or iPad Mini 3, or the iPads and iPhones you already own.