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GUI (pronounced GOO-ee) Graphical User Interface
A computer interface that uses graphics to make programs easier to use. The two best known Graphical User Interfaces are Microsoft Windows and the one used by the Apple Macintosh. They feature the following basic components:

Pointer : A symbol that appears on the display screen and that you move to select objects and commands. Usually, the pointer appears as a small angled arrow. Text -processing applications, however, use an I-beam pointer that is shaped like a capital I.
Pointing Device : A device, such as a mouse or trackball that enables you to select objects on the display screen.
Icons : Small pictures that represent commands, files, or windows. By moving the pointer to the icon and pressing a mouse button, you can execute a command or convert the icon into a window. You can also move the icons around the display screen as if they were real objects on your desk.
Desktop : The area on the display screen where icons are grouped is often referred to as the desktop because the icons are intended to represent real objects on a real desktop.
Windows: You can divide the screen into different areas. In each window, you can run a different program or display a different file. You can move windows around the display screen, and change their shape and size at will.
Menus : Most graphical user interfaces let you execute commands by selecting a choice from a menu.