From Tapestries MUCK
If a room is HAVEN, you cannot kill in that room. If a player is set HAVEN, he cannot be paged.
- HAVEN, when set on a program is called HARDUID, and causes that program to run with the permissions of the owner of the trigger, rather than with the permissions of the user of the program. When this is set in conjunction with the STICKY (SETUID) flag on a program, and the program is owned by a wizard, then it will run with the effective mucker level and permissions of the calling program. If the caller was not a program, or the current program is NOT owned by a wizard, then it runs with SETUID permissions.