Body slides in Aha! presentations have headers enabled by default. Headers appear at the top of a slide, and will persist across the top of the slide as you scroll horizontally.
Footers appear at the bottom of a slide, and will persist across the bottom of the slide as you scroll horizontally and vertically.
From the Slide tab of the slide editor, you can enable or disable headers and footers for a given slide by checking or unchecking the appropriate boxes. Each header or footer can have its own unique styling, and include an optional dividing line to differentiate it from the body of a slide.