1.1.3.1 GUI

A GUI uses the graphical abilities of a computer to interface with an end user, rather than using a command-line interface (CLI). The use of a GUI means an end user does not need to remember names of commands, and enter such commands using a keyboard. Instead, the basic operation of a computer becomes more intuitive.

In a GUI, abstract objects and concepts are often represented by a small picture (icon) of a real object. For example, a directory (also known as a folder) is represented by a small picture of a file folder. Similarly, there is a ``trash can'' to throw useless files into, and each document is represented by a small picture.

We'll discuss the GUI operation of Windows XP later on. At this point, however, we just have to understand the importance of being able to point to an object in a GUI. This allows a user to select a particular object in the GUI, then specify what to do with it. The ``pointer'' in a GUI is, essentially, analogous to a hand in reality.

In order to control the ``pointer'' in a GUI, a user needs a pointing device. A pointing device is a piece of hardware that allows a user move a GUI pointer, as well as to trigger operations through buttons.