ed when
corresponding messages are sent.
Class definition is assigned to the symbol's special value.
You may think of <B>class</B> as 
the counter part of Common Lisp's <B>structure</B>.
Slot accessing functions and <B>setf</B> methods are automatically defined
for each slot by <B>defclass</B>.

<P>
Most classes are instantiated from the built-in class <B>metaclass</B>.
Class <B>vector-class</B>, which is a subclass of <B>metaclass</B>,
is a metaclass for vectors.
If you need to use class-variables and clas