W4 Messages is intended for use during conferences or lectures (possibly even exams) where someone (The lecturer, presenter or the students) needs to know timing details of the event. At it's simplest, W4 Messages can be used as a countdown timer. The length of the talk or exam can be set, and then hitting 'Start' will start the countdown. For more advanced users, the W4 Messages output screen shows two other pieces of information: First, some text intended for timing information or any other important information. These details can be pre-programmed to correspond to times in the countdown (so for instance, you can start a countdown of 1 hour, and flash the screen red at 10 minutes, and display a message at 1 minute remaining, all by setting it up at the beginning). Second, a messages window for giving less important information to the speaker.