Windows NT 4.0 is a preemptively multitasked graphical operating system, designed to work with either uniprocessor or symmetric multi-processor computers. It was part of Microsoft's Windows NT family of operating systems and was released to manufacturing on 31 July 1996. It is a 32-bit operating system available in both workstation and server editions with a graphical environment similar to that of Windows 95. It was officialy released on August 24, 1996, approximately a year after Windows 95.