When the time comes to screen and present your work, you have a powerful Slide Show mode that gives you total command over how your slides are displayed and sequenced, so that you can focus on addressing your audience (which slides get shown; manual or timed slide transition; pointer visible or invisible; navigator visible/invisible; ...).
Impress supports multiple monitors, and the standardly-incorporated Presenter Console Extension gives you yet more control over your slide show presentation, such as the ability to see the upcoming slide, view your slide notes, and control the presentation timer while the audience is looking at the current slide.