This instructible shows you how to use two monitors one computer
Step 1: Plug in Monitor Power and Vga
Plug in the power and vga cables from the monitor
Step 2: Power on the Computer
Make sure that all the cables are connected correctly before turning on the computer.
Step 3: Settings
Select the right resolution, and witch monitor you want to be the primary monitor.
Step 4: There It Is!
there you have it, two monitors, one computer