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  \code{NextMethod} works by creating a special call frame for the next
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  \code{NextMethod} works by creating a special call frame for the next
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  method.  If no new arguments are supplied, the arguments will be the
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  method.  If no new arguments are supplied, the arguments will be the
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  same in number, order and name as those to the current method but
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  same in number, order and name as those to the current method but
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  their values will be promises to evaluate their name in the current
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  their values will be promises to evaluate their name in the current
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  method and environment.  Any named arguments matched to \code{\dots}
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  method and environment. Any arguments matched to \code{\dots}
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  are handled specially: they either replace existing arguments of the
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  are handled specially: named arguments either replace existing arguments
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  of the same name or are appended to the argument list, unnamed arguments are
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  same name or are appended to the argument list.  They are passed on as
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  appended to the argument list.  They are passed on as
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  the promise that was supplied as an argument to the current
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  the promise that was supplied as an argument to the current
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  environment.  (S does this differently!)  If they have been evaluated
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  environment.  (S does this differently!)  If they have been evaluated
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  in the current (or a previous environment) they remain evaluated.
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  in the current (or a previous environment) they remain evaluated.
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  (This is a complex area, and subject to change: see the draft
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  (This is a complex area, and subject to change: see the draft
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  \sQuote{R Language Definition}.)
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  \sQuote{R Language Definition}.)