Can I have more then 1 dynamic area


As a first project I will try to convert this site : as a ruby on rails site.
But now I wonder how I can make more then 1 dynamic area.
So 1 area for the text, one for the recent posts and 1 for the menu.
I know I can do that with one erea with but if I only use it how
does Ruby on Rails know which area I mean.