The Windows family currently encompasses the main consumer version named simply Windows, as well as Windows Server for the server market and Windows IoT for the embedded market, although they are all based on the common desktop Windows codebase. Internally, another variant called Windows Core OS is also currently in development, which is also based on the NT kernel, although it is not based on desktop Windows. In the past, the family also included Windows RT for ARM-based tablets, Windows Phone or Windows Mobile for smartphones, Windows Embedded Compact, or the MS-DOS based line.