Just like heaven has 4 alternatives for each upper and lowercase glyph. It uses OpenType technology to cycle through those alternative glyphs so you shouldn’t get the same letter twice in the same word. That makes everything look a little bit more random.
The alternatives are only available via OpenType-aware applications. Applications such as Photoshop, Illustrator and InDesign.
The alternative glyphs are also in stylistic sets, so you can select them manually if you want to.