super

  The super message allows messages to be sent to an object's
  superclass. This is a very important capability, since in a subclass
  method, it is often necessary to invoke a method of the same name in a
  superclass. The easiest way to do this is by using the super message,
  as follows:

    obj:super:message()

  Note that the result of a super message is just a reference to the
  original object, so it does not usually make sense to save this value. See
  Reference Objects for more information.