Copyright Goodheart-Willcox Co., Inc. 43 Chapter 2 Operating Systems is referred to as GUI (pronounced gooey). Th e command-line interface is commonly referred to by Microsoft as the command prompt. Graphical User Interface A graphical user interface (GUI) allows the user to perform functions by select- ing on-screen icons rather than by issuing text-based commands. Although DOS and DOS-like systems controlled over 80 percent of the early PC market during the 1980s, the user-friendly GUI of Macintosh soon gained popularity. Creating GUIs for the PC in the form of Windows 3.1 and Windows NT helped Microsoft retain control of the operating system market. In most operating systems that are used today, the GUI displays the fi le sys- tem consisting of folders, icons, and names. Th is fi le system interface is called File Explorer or, more often, Explorer. One great advantage of using the GUI is that the entire fi le structure is easily displayed and interpreted. Figure 2-2 shows a typical GUI display of a fi le system organization. A typical GUI is seen in Figure 2-3. Although this is a Windows 10 desktop, all Windows GUIs are very similar. Visible on the desktop and taskbar are a number of program icons. 1001: 1.5 Goodheart-Willcox Publisher Figure 2-2 A graphical user interface (GUI) provides a more user-friendly method of fi le management than issuing text-based commands. Goodheart-Willcox Publisher Figure 2-3 The desktop GUI for all Windows operating systems is similar in look and feel.