A projection screen for use in a projection system is described. Enabling a succeeding writing process includes searching the linking area and enabling a start writing signal and activating a laser power. A first anneal step is performed to remove carbon impurities and optionally includes a H2 plasma treatment. A received packet having a sequence number is pre-processed before packet processing using the single global anti-replay window. However, a gaze detection device can obtain information that indicates a user is not looking at the typed word on the display. The update manager transmits the updated contact information to the dialer communications device for an automatic update.