I dont know, runescape is java based. And most java based games are hosted on 1 computer, so the others can play. But if they made a dowloadable version, then they would have to give out their source code which is not a good thing. Even they have to make clients, for us to play the game so there are alot of flaws in your post. -I maybe wrong with my statement, but thats all I know from knowledge.