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  internal \R objects, passing the arguments to the code as a sequence
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  internal \R objects, passing the arguments to the code as a sequence
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  of \R objects.  They assume C calling conventions, so can usually
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  of \R objects.  They assume C calling conventions, so can usually
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  also be used for C++ code.
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  also be used for C++ code.
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  For details about how to write code to use with these functions see
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  For details about how to write code to use with these functions see
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  the chapter on \sQuote{System and foreign language interfaces} in
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  the chapter \manual{R-exts}{System and foreign language interfaces}.
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  the \sQuote{Writing R Extensions} manual.  They differ in the way the
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  They differ in the way the arguments are passed to the C code:
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  arguments are passed to the C code:  \code{.External} allows for a
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  variable or unlimited number of arguments.
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  \code{.External} allows for a variable or unlimited number of arguments.
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  These functions are \link{primitive}, and \code{.NAME} is always
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  These functions are \link{primitive}, and \code{.NAME} is always
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  matched to the first argument supplied (which should not be named).
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  matched to the first argument supplied (which should not be named).
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  For clarity, avoid using names in the arguments passed to \code{\dots}
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  For clarity, avoid using names in the arguments passed to \code{\dots}
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  that match or partially match \code{.NAME}.
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  that match or partially match \code{.NAME}.
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  \bibshow{R:Chambers:1998} (\code{.Call}.)
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  \bibshow{R:Chambers:1998} (\code{.Call}.)
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}
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}
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\seealso{
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\seealso{
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  \code{\link{dyn.load}}, \code{\link{.C}}, \code{\link{.Fortran}}.
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  \code{\link{dyn.load}}, \code{\link{.C}}, \code{\link{.Fortran}}.
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  The \sQuote{Writing R Extensions} manual.
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  The \manual{R-exts}{} manual.
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}
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}
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\keyword{programming}
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\keyword{programming}