W530 - How does things work when having two graphics cards?

So I have a W530 with an Intel HD Graphics 4000 and a NVIDIA Quadro K2000M.
How does things work when the computer has two graphics cards? I mean, is only one active at a time? Or is one doing complex calculations while the other one might be the one displaying them on the screen?
Related question:
I just bought and installed the game Portal 2. How do I know if it is using the better graphics card (NVIDIA Quadro K2000M)? And if it is not, how do I configure Windows, Steam or Portal 2 to use it to its full potential?

Technically, the Intel integrated graphics is always active, although it is not always in use. Nvidia graphics will turn on and off according to need. Software from Nvidia called Optimus automatically switches between integrated (Intel) and dedicated (Nvidia) graphics, according to the application. Portal 2 will run smoothly at maximum settings and native 1920x1080 resolution using the K2000M. The easiest way to see which graphics card is in use is to check the "Display GPU activity icon in notification area" option in the Desktop menu of the Nvidia control panel. It should automatically use the Nvidia graphics card when Steam is running. If it does not, you can add Steam to the program settings in Nvidia control panel and select that it should always use the Nvidia graphics.
Also, if you are using an external monitor and the notebook monitor, then you will be using both graphics cards - the Intel graphics will drive the notebook screen and the Nvidia card will power the external display(s).
Thinkpad W530, i7-3720QM, 1920x1080 screen, 32GB RAM, dual SSDs (Samsung 830, Crucial M4 mSATA), Quadro K2000M, 9-cell battery, DVD burner, backlit keyboard, Bluetooth, Intel 6300 wireless card

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