& ENTER_OK
 
  Flag: ENTER_OK(e)
 
  If an object or person is ENTER_OK, other players may 
  enter the object or person by using 'enter <object/person>. Players
  must also have the ENTER_OK set if they wish to be able to receive 
  things given to them by other players via the 
  'give <player> = <object>'.
 
  See also: give, enter