ION LAYER SHADOW MOBILE DEVICE AGENT Fig. 8. Appli ation Intera tions The appli ation intera tions are illustrated in Figure 8. A mobile user uses a browser on a laptop to a ess information. The browser sidebar intera ts dire tly with a User Appli ation, whi h is also an agent running on the laptop. User's requests are sent by the browser sidebar to the User Appli ation. If no User Agent is sta...