Only 15 years ago most families in the Western world did not own even one PC. Nowadays, in many European countries we find multiple computers per household, with even individuals sometimes owning more than one PC. The recent production of small and relatively cheap notebooks, like the Acer EEE PC, is contributing to this trend. The number of personal computers in the world surpassed one billion units in 2008 and expectations are that this number will double by 2015.