Thank you for your contributions to Wikipedia. Before saving your changes to an article, please provide an edit summary, which you forgot to do before saving your recent edit to Operating system. Doing so helps everyone to understand the intention of your edit (and prevents legitimate edits from being mistaken for vandalism). It is also helpful to users reading the edit history of the page. Thank you. --M4gnum0n (talk) 08:07, 17 September 2010 (UTC)