for what it's worth : I can only repeat what an IT-Professional explained to me recently.
If you want to use two monitors, your graphics card must support "dual monitor display" - in other words:
If your card only supports one monitor, than that's all you can use with one computer. The good news is that most of the new graphics cards have dual monitor display support.
The option that JVD is referring to presumes that you have more than one computer - hence the network talk.
In a nutshell : Find out whether your graphics card supports dual monitor display - if it does, you need two monitors and one computer.
It makes sense, doesn't it??