If a thing is STICKY, it goes home when dropped (See HOMES). If a room is STICKY, its drop-to is delayed until the last person leaves (See DROP-TO). If a player is STICKY (SILENT), they don't see the dbrefs on things they own, and they do not see dark objects. If an exit is linked to a Thing, and it is located on another Thing, then if the exit is not STICKY, the Thing the exit is located on will go home when the exit is triggered. If a program is STICKY (SETUID) it runs with the permissions of the owner of the program, not the perms of the user.