There are six types of objects in DragonMud:
Rooms, Exits, Players, Things, Groups, and Garbage.
Each type of object (except (garbage)) has a set of flags that are meaningful:
Players: Male, Female, Neuter, Unassigned, Haven, Bot/Robot*,
Constructor/Creator/Builder*, Wizard*, God*, Tellall,
Reverse_Who, Tabular_Who, Quell, Dark.
Rooms: Sticky, Abode, Link_Ok, Unwanted, Haven, Bot, Temple*,
Quell, Dark, NoPage, NoWhere, NoWho, Windy.
Things: Sticky, Unwanted, Copy, Quell, Dark.
Exits: Bot, Hushed, Unwanted, Tattle, Quell, Dark, Lookable.
Groups: Tattle, Sticky, Owner-Group, Copy, Quell, Dark.
* - Special privs needed to set this flags on this type of object.
Quell and Dark work on all objects.