Shared publicly  - 
Barry Carlyon's profile photoCamille Ainsworth's profile photo
Essentially for a Mac Book that has two Graphics cards it lets your switch which is in use without having to logout and in again. Thus leaving all your Applications running.
The different between the two Graphics Cards is one is High Power optimized for gaming/video work (and drains your battery quicker) and the other is optimized for battery life.
Add a comment...