Neverware uses a technique known as desktop virtualization. Instead of relying on individual PCs or laptops, Neverware installs a single custom server designed for the specific school. This master machine, dubbed the “Juicebox”, is the brains of the entire system. The individual computers become “thin clients,” essentially dumb screens that are powered by Neverware’s Juicebox. A workstation could continue to operate, even if the hard drive was removed.
“The transformation was incredible,” says Hornik. Ten year old machines were suddenly running Windows 7 at blazing speed. “We went from having around 20 computers that performed terribly to 150 machines that run like they are brand new.”" -- from source: http://www.theverge.com