Android phones, apps and tablets

Does that technique work for all Android phones?

I have a Desire S (t updated normally, not modded or anything) & the internet would suggest that you can't screen capture, yet I did it by accident the other day, now it won't do it no matter what I press!

www.androidforums.com/htc-desire-s/438977-screenshot-now-available.html

I think it does work. Though a bit tricky to time it just right.