Classes Corresponding to Basic Data Types
Call the Current Generic Function from a Method
Can an Object be Coerced to a Certain S4 Class?
Compute an Adjacency Matrix for Superclasses of one or more Class Definitions
Using and Creating On-line Documentation for Classes and
  Methods
Internal Class representing Empty Methods List
Description of the Methods Defined for a Generic Function
Fix Objects Saved from R Versions Previous to 1.8
Get or Test for the Definition of a Method
The Name associated with a Given Package
Manage Implicit Versions of Generic Functions
Names of Slots Inherited From a Super Class
Methods to Initialize New Objects from a Class
Classes to Represent Unevaluated Language Objects
Defunct Functions in the Methods Package
Class MethodsList, Deprecated Representation of Methods
Additional (Support) Functions for Methods
Utility Functions for Methods and S-Plus Compatibility
A non-structure S4 Class for basic types
A Vector of Object Names, with associated Package Names
Generate a Shell for Documentation of a Formal Class
Generate a Shell for Documentation of Formal Methods
Utilities for Managing Class Definitions
Construct a Representation or a Prototype for a Class Definition
Class to Represent Inheritance (Extension) Relations
Super Classes (of Specific Kinds) of a Class
Deprecated:  Session Data and Debugging Tools
Classes Defined as the Union of Other Classes
Register Old-Style (S3) Classes and Inheritance
Show all the methods for the specified function(s)
Class "signature" For Method Definitions
The Slots in an Object from a Formal Class
Classes Corresponding to Basic Structures
Test for and Report about  Selection of Inherited Methods
Classes Used Internally to Control Tracing