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  exists, or an error results.
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  exists, or an error results.
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  Function \code{\link{methods}} can be used to find out about the
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  Function \code{\link{methods}} can be used to find out about the
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  methods for a particular generic function or class.
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  methods for a particular generic function or class.
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  \code{UseMethod} is a primitive function but (as from \R 2.11.0) uses
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  \code{UseMethod} is a primitive function but uses standard argument
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  standard argument matching.  It is not the only means of dispatch of
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  matching.  It is not the only means of dispatch of methods, for there
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  methods, for there are \link{internal generic} and \link{group generic}
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  are \link{internal generic} and \link{group generic} functions.
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  functions.  \code{UseMethod} currently dispatches on the implicit
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  \code{UseMethod} currently dispatches on the implicit class even for
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  class even for arguments that are not objects, but the other means of
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  arguments that are not objects, but the other means of dispatch do
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  dispatch do not.
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  not.
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  \code{NextMethod} invokes the next method (determined by the
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  \code{NextMethod} invokes the next method (determined by the
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  class vector, either of the object supplied to the generic, or of
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  class vector, either of the object supplied to the generic, or of
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  the first argument to the function containing \code{NextMethod} if a
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  the first argument to the function containing \code{NextMethod} if a
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  method was invoked directly).  Normally \code{NextMethod} is used with
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  method was invoked directly).  Normally \code{NextMethod} is used with