The second‑edition Inform Designer manual provides detailed guidance on fundamentals, the model world, parsing, testing, language, compiler and library…
This manual is the second edition of the Inform Designer documentation. It covers the core concepts of Inform, including the model world that defines the game environment, the fundamentals of describing and parsing objects, and the testing and hacking tools available to authors.
Later sections give a full language and compiler reference, a library reference, a short Inform lexicon, and answers to all exercises. The document also describes switchable objects, containers, doors, and other gameplay mechanics supported by the Inform engine.
Doors are created using the door command with a direction and optional closed state.