<P> Internal security is especially relevant for multi-user systems; it allows each user of the system to have private files that the other users cannot tamper with or read . Internal security is also vital if auditing is to be of any use, since a program can potentially bypass the operating system, inclusive of bypassing auditing . </P> <P> Every computer that is to be operated by an individual requires a user interface . The user interface is usually referred to as a shell and is essential if human interaction is to be supported . The user interface views the directory structure and requests services from the operating system that will acquire data from input hardware devices, such as a keyboard, mouse or credit card reader, and requests operating system services to display prompts, status messages and such on output hardware devices, such as a video monitor or printer . The two most common forms of a user interface have historically been the command - line interface, where computer commands are typed out line - by - line, and the graphical user interface, where a visual environment (most commonly a WIMP) is present . </P> <P> Most of the modern computer systems support graphical user interfaces (GUI), and often include them . In some computer systems, such as the original implementation of the classic Mac OS, the GUI is integrated into the kernel . </P> <P> While technically a graphical user interface is not an operating system service, incorporating support for one into the operating system kernel can allow the GUI to be more responsive by reducing the number of context switches required for the GUI to perform its output functions . Other operating systems are modular, separating the graphics subsystem from the kernel and the Operating System . In the 1980s UNIX, VMS and many others had operating systems that were built this way . Linux and macOS are also built this way . Modern releases of Microsoft Windows such as Windows Vista implement a graphics subsystem that is mostly in user - space; however the graphics drawing routines of versions between Windows NT 4.0 and Windows Server 2003 exist mostly in kernel space . Windows 9x had very little distinction between the interface and the kernel . </P>

What is the name of the gui operating system you are using