turn your nintendo ds into a wardriving tool

This here application will let you use your Nintendo DS to detect wireless networks, and may well fulfill every dream Jeff has ever had, except that it still won’t play dvds.
[Via Engadget and all kinds of other people.]
I might be thick, but: how does one load this on their DS?
I have no idea. I don’t even know what a “Nintendo DS” is.
It’s a hat, I believe, that’s getting all kinds of weird software.
This explains it.