How do you switch between Intel graphics and Nvida GPU(555M)?

Hey, silly question here but.....
this is the first time I dealt with dual graphics on a laptop, and I have a stupid question:
How do I know that the 555M is actually being used when I play SCII?
Can I manually change from the Intel graphics, which (an educated guess) is in charge most of the time, but when I want to play a heavy graphics game, how do I know the that the GT555M is running the show?
I know I should know, but senility is setting in and I forget
any ideas?

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It does it automatically.

 

Yeah, I know it does it automatically....
I was looking for a way to MANUALLY change it from Intel to Nvidia...
Look, not looking for a war of the minds, just ideas.
Do you know how?
if not, move on.

 

Found, well actually was given the aswer on the L702x thread....

Thanks Beertha!!!
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