It's not a special stitch on my Bernina 1240; I think any machine can do it provided you can adjust the tensions correctly. The specialty stitch for it probably just presets the tensions.
I did find this Youtube video:
http://www.youtube.com/watch?v=VKuoKjVepYU
Edit: I take it back about the specialty stitch, as it does look a little different than my old version.