I run this XServe headless. I also have VirtualBox on it. To start a VM via ssh I need to first use VNC and login to the account that has permissions for VB. Then either via the Terminal application ...
Late on Friday, December 13, Valve released the first public version of SteamOS. As you would expect, SteamOS is currently very rough around the edges -- it is essentially just a version of Debian 7.1 ...