Graphics Emulation

I have a broad question,

Graphics emulation has a lot of choices underneath can soemone point me in the direction where i can read stuff about them ? : )
or some kind of bible?
something :slight_smile: anything :stuck_out_tongue:

http://unity3d.com/support/documentation/Manual/GraphicsEmulation.html

:wink:

Thank you Shawn :slight_smile: