It was used by the W3C staff to generate their slides.
This tool allows to reduce the time needed to produce those slides, ensure an uniform look, and guarantee a minimum level of quality of the HTML output.
The principle is to write a single HTML file, all.html, using H1 elements as the page boundary, the H1 content providing the slide title.
Usually the all.html file is a succession of H1 elements and UL lists.
The file info.txt need to be tuned to provide the correct metadata informations like the talk subject and authors.
Then run make to generate the slides.