Windows NT employs a Graphical User Interface, and this document makes heavy use of graphical screen shots of the various items in the interface. The operating system controls all the hardware. In fact, it does so to the point that the BIOS is only used to load the boot strap program that will load the Windows NT operating system. After that, everything is Windows NT code, so each piece of hardware must have a Windows NT driver. If it doesn't have a driver, it simply is not supported.
Many older programs take direct access to the hardware to improve speed.
These kinds of programs often write directly to the video card to speed performance, and NT does not allow this, as it is a threat to the stability of the system. The two are mostly identical, but Workstation is optimized for single user and fast application response, while Server is optimized for fast network response. Currently, the NT workstations in the UCS labs have Windows NT Workstation version 4.0 installed. There are no UCS Windows NT Servers, thus any items unique to NT Server will not be covered in this document. Windows NT implements many advanced concepts, including Access Control Lists on everything from printers, files, and directories to processes.