Very few laptops support 3 displays. That is the internal and 2 externals.
To get more screens the most common method is an USB Video card.
I have a laptop and i keep the lid closed (the screen broke) and i use an external mouse, keyboard, and monitor. Recently, I bought a second external monitor and a vga splitter ( http://tinyurl.com/l7bggmj )
I plugged it into my laptop (again the lid of the laptop is closed) and the computer registers it as one monitor and duplicates whats on the screen.
Can anyone help me out? I'm trying to extend those two screens.