An event in a graphical user interface is an object that represents some action such as clicking a mouse, dragging the mouse, pressing a key on the keyboard, or any other action that is expected to elicit a response. Actually, events are more general that just the events of a GUI. For example, a message from a printer to the operating system saying that the printer is ready to print another document can be considered an event -An event in a graphical user interface is an object that represents some action such as clicking a mouse, dragging the mouse, pressing a key on the keyboard, or any other action that is expected to elicit a response.　Actually, events are more general that just the events of a GUI.　For example, a message from a printer to the operating system saying that the printer is ready to print another document can be considered an event