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Tip
To add a slide number or date and time to every slide, on the View menu, click Header and Footer, and then select the appropriate options. The slide number and date and time are positioned in default placeholders on the slide. You can change the position of these placeholders on the slide master (slide master: The main slide that stores information about the theme and layouts of a presentation, including the background, color, fonts, effects, placeholder sizes, and positions.).