Multiple Display Adapters - Why??

Hi guys,
Got me a new W520.  See something odd I don't understand...  In Device Manager, I have two Display Adapters:
Intel HD Graphics Family
NVIDIA Quadro 2000M
I am by no means a hardcore graphics user and I am not a gamer, but I added the 2000M when ordering because, well...  Why not?  Anyway, the first thing I did to this thing was rebuild it with a fresh copy of Windows 7 Pro x64.  At some point, I realized the Intel graphics were not installed and as a result, I had NO video.  So...
Why are there two graphics cards?
Why do the Intel drivers need to be operational with the NVIDIA there?
How can I even tell what is actually driving my displays??!!
Which brings me to...
This laptop is docked 80% of the time.  Connected are three 24" LCDs.  LCDs 1 & 2 are connected directly to DVI ports on the dock.  LCD 3 is connected using a Lenovo USB2DVI Adapter.
All run at 1920x1200 resolution and overall work fine, although I do sometimes detect flickering and "waviness".
I just wanna get the most out this system; graphically and otherwise.  It's running the SSD HDD and 8GB RAM, so combined with the NVIDIA, this thing should be a beast.  The NVIDIA Control Panel doesn't seem to actually have any settings I could adjust even if I should or wanted to.  And in the programs list under NVIDIA, all I have are the options to enable or disable "3D Vision".  Don't even know what that is.
So, what should I be doing here?  Anything?  Nothing?  Thanks!

I'm not joking.
In BIOS (press F1 key when you see turn on the computer and see the Thinkpad screen) you can select the different graphics mode of the machine.  As you are keenly aware, the machine does have 2 graphics processors.
Under Display:
Selecting the Integrated option in BIOS shuts off the nVIDIA graphics card and uses the lower power Intel graphics 3000 on the CPU.  This limits graphics performance, but allows for longer battery operation and full CPU speed on battery. 
Selecting the Discrete option in BIOS forces the system to use the nVIDIA card.  This improves graphics performance, allows you to use multiple monitors, but decreases CPU performance while using battery and reduces battery life.
Selcting Optimus allows software or the user to determine which graphics processor to use "on the fly" so that power budget and GPU performance are balanced for the workload.

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