& @aenter
 
  Syntax: @aenter <object> = <command-list>
  Attribute: Aenter
 
  Sets the action to be taken by an object or room when someone enters
  it, whether by using an exit, the enter or leave commands, or by
  teleporting.
 
  This attribute is meaningful for players, things, and rooms, and
  will never be automatically triggered on exits.
 
  Example: 
  @aenter car = :starts its engine.; "Beep Beep!
 
  See also: enter, @enter, @oenter, ENTER_OK