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  Arguments
 
    object_variable    Instance of class
 
    class_name         Class to test for membership of object_variable
 
  Returns
 
    Boolean            True if object_variable is a member of
                       class_name; otherwise False
 
  Description
 
   The Member function tests for membership of an object in a given
   class and returns a Boolean value. Membership implies that
   object_variable understands the methods of class_name, and of all
   ancestors of class_name.
 
   If object_variable is a member of a descendant of class_name,
   then it is also a member of class_name.
 
   Member may be used to screen object references before casting the
   object to another class.