VIRI
http://sl.wikipedia.org/wiki/Operacijski_sistem
Google slike
http://www.apple.com/
http://www.microsoft.com/sl-si/default.aspx
http://en.wikipedia.org/wiki/Mobile_operating_system
http://www.techradar.com/news/software/operating-systems/windows-compared-windows-7-vs-vista-vs-xp-615167/8#articleContent
