visibility

Topic: Visibility

Exits and Things can have conditional visibility, meaning
that in certain circumstances, certain people can see them, and
other people can't see them. Visibility is regulated by the second
lock, ie: @lock Exit = (use-key) ; (visibility-key)

Players that control conditionally visible exits and things can
set themselves TELLALL to force them to appear regardless of lock.

@lock,
locks,
dark,
tellall,
or return to The Index.