Most modern computer software employs a graphical user interface or GUI. A GUI displays text as well as small images (called icons) that represent objects such as directories, files of different types,command buttons, and drop-down menus. In addition to entering text at the keyboard, the user of a GUI can select an icon with a pointing device, such as a mouse, and move that icon around on the display. Commands can be activated by pressing the Enter key or Control keys, by pressing a command button, or by selecting a dropdown menu item with the mouse. Put more simply, a GUI displays all information, including text, graphically to its users, and allows them to manipulate this information directly with a pointing device. The structure of a GUI program differs significantly from that of a terminal-based program. Second, a GUI program is event driven, meaning that it is inactive until the user clicks a button or selects a menu option. In contrast, a terminal-based program maintains constant...
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