Usage Reference
     Classes
         Class Objects
         Class Functions
         Class Messages
         Class Variables
         Class Methods
         Class Initialization
         Uses of Class Objects
             Creating New Objects
             Comparing Classes
             Checking an Object's Class
     Comparing Objects
     Constructors and Initializers
         Constructor Messages
         Initializer Methods
     Instantiation and Performance
     Debugging
         Enhanced Object Inspector
         Standard Object Inspector
             Viewing class variables
             Viewing superclass variables
             Anomaly
         Error Reporting
         The Debugger's Command Window
     Deferred and Null Methods
         Deferred Methods
         Null Methods
     Inheriting from Clipper's classes
         Inheriting from TBROWSE
         Inheriting from GET
     Length of Variable Names
     Linking and Overlaying
         Overlaying
         Link Sequence
         Linking of classes
     Message Forwarding
     Performance
     Predefined messages
         super
         class
         classH
         className
         perform
 Advanced Topics
     Alternate Constructors
     Delegation
         Delegation vs. Inheritance
         Full Polymorphism Using Delegation
         Partial Polymorphism
         Delegating to Sender
     Error System
     External Methods
     Instantiation
     Metaclasses
     Multiple Inheritance
         Invoking Initializers
         Name Conflicts
         Warning
     Reference Objects
     Reserved Words
     Scalar Classes
     Symbol Class
     System Classes