QQ: Is it possible to have more than one monitor plugged into desktop PC?

Yes of course. I have integrated i3-2130 gfx (HD2000) and it can run VGA and DVI outputs simultaneously. I also have old HD4350 that also has VGA and DVI outputs.

*no SLI, no CrossFire !! :)

And here comes the most funny part of it all:
BIOS automatically disables integrated SandyBridge gfx when I put any gfx card into PCI slot without even single message. So I had to get into BIOS, find that setting and enable both at the same time (which took time to find it and correctly set it).

After loading OS, "enhanced workspace" is set automatically (in notebooks it duplicates your current view; it can be quickly changed by pressing WinFlag P).

But what does it actually do, how does it look?

One of the monitors is set as primary and the other as secondary. Basically the primary has Taskbar and the secondary not. Additionally the primary monitor is used as default for whatever application that is running (like games, folders...). You can set and change which monitor to use as "primary" any time you want.

I have 2 monitors: 17" 19" (both 5:4) so I have same resolution (1280x1024). I customized the settings a bit: bigger monitor is primary but I moved Taskbar to second monitor, so I can play games on bigger screen and see changes in temperatures, cpu and ram loads on the second screen at once without pressing Alt Tab.

Having 2 monitors is also very useful when comparing any 2 windows or programs like web browser, image tools; it's also possible to drag a window over both monitors (for ex. for editing music or videos), but it looks funny when the screens aren't exactly same-sized:)

Another interesting thing is that it's possible to have one background-image through both monitors! (you have to make image with exact screen aspect ratioand choose "fill screen" in wallpaper settings.

So finally I got 3rd gfx card to try 3 monitors on one rig;

gfx cards (simultaneously): HD i3-2130, HD4350, 7300GT; no SLI/CFX and no problems!!
*same res. 1280x1024 for each monitor, non-integrated gfx in "silent" ver. (without fans)

gpu-z IMAGE here: http://imageshack.us/photo/my-images/268/3gfx.png/

Currently I moved 7300GT to my "server pc", all gfx cards run at DVI, so the signal is more "similar" and constant without "waving";

**next step is to manage 1mouse 1keyboard control of both PCs at once :D