There's lots of functions listed at
http://wiki.frictionalgames.com/hpl2/amn..._functions
that use the bool "abEffects", but nowhere is it explained closer than "Use effects.".
I tried setting it to be true for SetSwingDoorLocked(), but while the door unlocked, no additional effects occur. There is one key-opened swing-door in Amnesia, at the prison level, but it has this flag set to false.
What does abEffects do?
(If you have access to the wiki, I'd rather you update the wiki page, than answer me personally.)