GRAPHICAL USER INTERFACES

               GRAPHICAL USER INTERFACES
It is common now for software packages to provide a graphical interface. A
major component of a graphical interface is a window manager that allows a user
. to display multiple-window areas. Each window can contain a different process
that can contain graphical or nongraphical displays. To make a particular window
active, we simply click in that window using an interactive pointing dcvicc.
Interfaces also display menus and icons for fast selection of processing options
or parameter values. An icon is a graphical symbol that is designed to look
like the processing option it represents. The advantages of icons are that they
take up less screen space than corresponding textual descriptions and they can be
understood more quickly if well designed. Menbs contain lists of textual descriptions
and icons.
 A typical graphical mterface, containing a window
manager, menu displays, and icons. In this example, the menus allow selection of
processing options, color values, and graphics parameters. The icons represent
options for painting, drawing, zooming, typing text strings, and other operations
connected with picture construction.