webgame with simultaneous players
<p>I have seen many webbrowser based games with players playing simultaneously.
Usually after waiting some time you can join a room where everyone is playing or you can play against one other player.
All those games use Flash.</p>

<p>How they achieve that?
It would be very complex to accomplice without Flash?</p>

<p>There are any toolkit (rails, etc) or plugin that provides this functionality?
Or it is just a matter of storing sessions and mixing them ?</p>

<p>Just a quick edit:
I am not interested in Flash or Silverlight solutions</p>
