The point is for a kid without a computer to get access to programming. Not for a kid, who already has a computer, to get access to a virtual computer to program on.
Wait, a computer is still needed to write your program, right? Or is everything done on the Pi?
Either way would work from what I understand: it's a web app that you can access from another computer on the network or the Pi itself. Of course, you'll need a monitor and keyboard.