Mentioned In Room Description by Ron Newcomb begins here.

"Objects, items, and people mentioned in square brackets within the room description or room heading will no longer be re-described later in the LOOK command."

"with special thanks to Erik Temple and Aaron Reed"

• Section - Initialise the 'mentioned' property much earlier in the locale-printing process
• Section - a small optimization
• Section - Here and Elsewhere as Adjectives
• Section - 'Mentioned Below'
• Section - the capitalised name of a thing
• Section - if capitalisation is needed
• Section - suggesting capitalisation
• Section - plural problems
• Section - I6 internals - unindexed
• Section - Look After Going