On Aug 28, 3:22 pm, Marc Heiler <sheve... / linuxmail.org> wrote:
> A simple question, what's it used for?

I think the examples in kr's post give a good idea of it's uses:

  http://groups.google.com/group/ruby-talk-google/msg/85bd05e0c7e33b46?hl=en&

T.