Using a digital camera and/or a computer, can I make it look like there are two of me at once?

Is there a certain program I need to get this to work, or will iMovie or Windows Movie Maker do it for me?

Please, a name of a program would be wonderful or instructions on how to manually do that. I want footage of me arguing with myself (as in two different people). I'm not really making sense, but oh well.

I would suggest Adobe Photoshop. It's the best.

Photoshop and Paintshop Pro, and other similar photo editting software will allow you to do that. You can cut yourself out of one picture and into another one, but it does take a lot of practice to make a convincing photo.

go to 9down.com.............u can have a free trials for picture and video edting software.