An Apple patent application published by the U.S. Patent and Trademark Office on Thursday describes an intelligent magnetic attachment system that provides an interface for an iPad to connect and communicate with a variety of accessory devices, including other iPads. Apple's patent for a "Magnetic attachment unit" has a basis in the keyed magnetic mechanism present in all iPads. Currently, Apple uses the internal magnet arrangement as a simple anchor point for Smart Covers or Smart Cases, but the proposed invention takes that idea much further. Starting from the mechanics of the property, Apple proposes a keyed magnetic structure be embedded in an iPad's chassis, much like the existing implementation. By using keyed magnets, that is a specific arrangement of magnets, add-on accessories can be optimally positioned repeatably without much fuss. Read the full story at AppleInsider.