The Xbox system software is the operating system developed exclusively for Microsoft's Xbox home video game consoles. Across the four generations of Xbox consoles, the software has been based on a version of Microsoft Windows and incorporating DirectX features optimized for the consoles. The user interface, the Xbox Dashboard, provides access to games, media players, the Xbox operating system provides standardized tools that facilitate game development specifically for Xbox, potentially limiting portability, and applications, and integrates with the Xbox network for online functionality.