Bibliografia
	Sites consultados http://www.tabletpcreview.com/assets/1190.jpg   http://www.pc-magazin.de/common/images/firefox_ie_desktop/firefox_ie_desktop_800x600.jpg   Adaptado de: http://vistastyles.org/wp-content/uploads/2006/09/vista_rc1_icon_pack_by_ears1991-preview.jpg   Adaptado de: http://lms.caixamagica.pt/objects/mm188/linux_history2.jpg