IOS 8 software and above has a special new feature called continuity.  This allows you to smoothly switch between any of your Apple devices.  If you are working on a document on your ipad.  You can walk over to your  computer and the same document will be open in your computer, you can switch to your iphone and the document will be open in your iphone.  In order to activate this “Hand off” feature , all the devices need to be logged on to blue tooth and the same wifi