The Microsoft Windows NT Workstation 4.0 CD Full Version is a complete operating system package that includes the CD key. Suitable for retail use, this version requires a minimum of 16 MB of RAM and 110 MB of hard drive space. Designed for Microsoft Windows NT operating systems, this CD includes the necessary components for installation on a single device. With a minimum processor speed of 66 MHz and support in English, this product is a reliable option for those looking to upgrade or reinstall their operating system.