<!-- $Id: 04-extended.sgml,v 1.1.1.1 2000/04/17 16:40:03 kk Exp $ --><sect>Extended functionality<p>The section on extended functionality covers non-GUI classesthat provide often needed application functions without a userinterface. Some extended classes depend on core functionality,some contain independent classes.Extended classes are treated differently from core classes inthat their code is not automatically included by<tt/prepend.php3/. You have to include the class definitionmanually where needed or you modify <tt/prepend.php3/.