The primary means for players to extend the MOO is for them to create new objects with interesting behavior. There are convenient commands for creating and recycling objects and for keeping track of the objects you've created. Help is available on these commands in the following topics:
@dig -- conveniently building new rooms and exits @create -- making other kinds of objects @recycle -- destroying objects you no longer want @quota -- determining how many more objects you can build @count -- determining how many objects you already own @audit -- listing all of your objects @classes -- listing all of the public classes available for your use @move -- moving your objects from place to place
@parents, @kids -- examine the inheritance hierarchy.