What type of video card do I need?
You only need to worry about the type of video output if you wish to run i-chart using a twin screen setup.
If you are using a laptop, you will not need to add a dual video output, as most laptops already have a plug to which you can add a second screen.
If using a PC, a dual head video card is required to provide two outputs for screens. Many PC's will now come with dual head video output, but if you system does not have this a dual head video card can be easily added to any desktop PC and is fitted in place of your existing video card.