PresenterClock enables speakers to see exactly where they are in their presentation, how long they have left and what the next slide will be. Because the software is an Add-in for PowerPoint, any notes for slides can also be displayed alongside the countdown clock, giving extra support and peace of mind. Once inserted, all PresenterClock settings are saved within the PowerPoint presentation file. All PresenterClock information is displayed on one screen which is only visible to the speaker. Clocks can be pre-set for multiple speakers to provide a seamless sequence of presentations all running perfectly to time. The PresenterClock is valuable not only for speakers, but also for show producers and show-callers. PresenterClock gives the producer control over sessions by allowing precise timing for each presenter. The show-caller can send brief messages to the presenter. For example, to remind them about a video clip they need to introduce before their next slide.