abstract:In an entity relationship diagram of a data model, one or more unique keys may be declared for each data entity. Each unique key is composed from one or more data attributes of that data entity.
With Windows 8 Microsoft shook things up, and made it so that PC manufacturers had to give each PC a uniquekey, making it much harder for the pirates to get a free lunch.
The unique Logitech concave key design gives you more comfortable and quiet typing, and offers more speed and precision than typing on an on-screen keyboard.