Is X11 the only option?

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http://www.linuxquestions.org – I'm curious if the X system is the only option for Linux? What I'm aiming for is a desktop with just a dockbar to navigate with. Avant, docky, etc. I'm looking for various ways to accomplish this. I know I can go with Gnome and just get rid of it's task bars... that's one option. But then I still end up with X11, Gnome AND the dock program. (HowTos)