If you aren't already aware, Platypus is a replacement for the standard
library used with Inform. If you have no idea what I'm talking about, press 1
now.

The documentation for Platypus is composed of five files, or however many are
listed after this colon:

    changes.txt      being a list of changes since the previous release

    convert.txt      being a brief guide to converting existing code,
                     included primarily for its educational value and not
                     its practicality

    tutorial.txt     being a tutorial in which a very simple game is 
                     constructed

    summary.txt      being an overview of the library and its use, and 
                     specifically the ways in which it differs from the
                     standard library

    ref.txt          being a (fairly) complete reference to the 
                     important-to-know elements of the library (classes,
                     properties, etc.)

    readme.txt       being Andrew Plotkin (It was inevitable.)


Also these examples:

    toyevil.inf      being an adaptation of Graham Nelson's "Toyshop"

    tutorial.inf     being the complete game as built in "tutorial.txt"


And the rest:

    skeleton.inf     being a starting point