STICKY
If a thing is STICKY, it goes home when dropped (See help homes). If a room is
STICKY, its drop-to is delayed until the last person leaves (See DROP-TOSooms.  If a player sets his STICKY bit, all pages to him are not permitted, thus
the player is free from noisy pages, which is useful if someone decides to
spam you via page.  You can not use the page command when your STICKY bit
is set.  Remember to clear your S bit before you log out (@set me=!S).