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joined:Dec 10, 2005
[edited by: wheel at 5:00 pm (utc) on Jul 13, 2011]
joined:Jan 30, 2006
Basically (I am not an expert on this, this is merely my understanding), you have 1 to more than one physical server. You install virtualization software on each of them as the main behind-the-scenes operating system. The effect of this is that all the machines now act as one single 'virtual' server.