Events

A GUI application program shows the user a graphical interface containing several graphical components. The user controls the application by interacting with the graphical components, doing such things as:

• Clicking on a button to choose a program option.
• Making a choice from a menu.
• Entering text in a text field.
• Dragging a scroll bar.

An action such as clicking on a button is called an event. In reading these notes you have been generating events by using the graphical interface of your Web browser.