Windows 10 is the current operating system developed by Microsoft as part of the Windows NT family of operating systems and was officially unveiled in September 2014, followed by a brief demonstration presentation at the Build 2014 conference. Test in October 2014 and was released to the general public on July 29, 2015. To encourage its adoption, Microsoft announced its free download for one year from its release date, for users who have genuine copies of Windows 7 ( SP1) or Windows 8.1 Update. In June 2015 a tool was enabled that allowed to reserve this update; This tool notified each user when the download of the update for their device would be ready, in order to install compilation 10240, the first stable version released.Participants in the Windows Insider program could receive a license for Windows 10 , but with certain conditions, among them that its operating system installed (7, 8 or 8.1) was legitimate. This edition introduced an architecture of "universal" applications. Developed with the Continuum interface and, subsequently, with the Fluent Design interface, these applications can be designed to run in all of Microsoft's product families with almost identical code (including personal computers, tablets, smart phones, embedded systems, Xbox One , Surface Hub and HoloLens). The user interface was revised to make transitions between a mouse-oriented interface and a touch screen-oriented interface based on available input devices (particularly tablets). Both interfaces include an updated Start menu that includes a mixed design of Windows 7 with the Windows 8 meter design. It also introduces the Task View, a virtual desktop system, the Microsoft Edge web browser and other new or updated applications, a Integrated support to log in via fingerprint or facial recognition called Windows Hello, new security features for business environments, DirectX 12 and WDDM 2.0 to improve the graphic capabilities of the operating system for video games.