The types of data objects that the Intuition library functions create and
control fall into six broad categories.  These are the main components an
application uses to build and operate a graphic user interface on the
Amiga.

                Table 2-2: gui components of intuition
  ____________________________________________________________________
 |                                                                    |
 |  screens       the display environment. sets the resolution and    |
 |                number of colors.                                   |
 |                                                                    |
 |  windows       a graphic rectangle within a screen representing a  |
 |                working context.                                    |
 |                                                                    |
 |  menus         a list of choices displayed at the top of a screen  |
 |                that can be selected with the mouse.                |
 |                                                                    |
 |  gadgets       a control symbolized by a graphic image that can be |
 |                operated with the mouse or keyboard.                |
 |                                                                    |
 |  requesters    sub-windows for confirming actions, accessing files |
 |                and other special options.                          |
 |                                                                    |
 |  input events  mouse, keyboard or other input activity.            |
 |____________________________________________________________________|