So, for example, you can revisit a master sales graph repeatedly in the course of the presentation without having to skip backwards and forwards. The slide is stored just once in memory, but can be summoned up at all the points where it's needed in the sequence. It has a far superior outliner, with some uniquely powerful hyperstructural search and link features. It's compatible with practically every Mac ever made, and with systems up to and including MacOSX Classic. Tree chart view is integrated into the program.
Files are extremely compact.
David Dunham's classic simple outliner, with very low memory requirements. Particularly nice to-do list features. Legendary word processor with excellent integrated outlining and annotation features. Some problems with some PowerMacs. I haven't tried this myself.