Alter Aeon FAQ (Frequently Asked Questions)

FAQ 19.4 - Barrier exit flags and GAME_AUTOMATION room flags

If you need to make rooms where players are not supposed to enter, make
sure they are connected to the rest of rooms in your area. You can prevent
players from seeing the exit and entering the room by setting a barrier flag
on the exit into the room. This will ensure the room is properly mapped and
not widowed as part of a fragmented negatve plane by the mapper.

A GAME_AUTOMATION flag will prevent the room from showing up on where,
block scrying spells and otherwise prevent players from seeing it using
remote methods.