________, shown as a half arrowhead in a sequence diagram, is one ...

[ARLKQ]

________, shown as a half arrowhead in a sequence diagram, is one where the sender does not have to wait for the recipient to handle the message.
 
  A) Simple message
  B) Activation
  C) Synchronous message
  D) Asynchronous message

Question 2

List and identify eight common devices for interacting with an information system.
 
  What will be an ideal response?

[Liddy]

Answer to Question 1

D

Answer to Question 2

The common devices for interacting with an information system are keyboard, mouse, joystick, trackball, touch screen, light pen, graphics tablet, and voice. Keyboards require users to push an array of small buttons that represent symbols that are then translated into words and commands. The mouse is a small plastic box that users push across a flat surface and whose movements are translated into cursor movement on a computer display. The joystick is a small vertical lever mounted on a base that steers the cursor on a computer display. A trackball is a sphere mounted on a fixed base that steers the cursor on a computer display. On a touch sensitive screen, selections are made by touching a computer display. With a light pen, selections are made by pressing a pen-like device against the screen. Using a graphics tablet involves moving a pen-like device across a flat tablet to steer the cursor on a computer display. The voice device captures spoken words.