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\item{package}{an optional character string specifying the name of a
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\item{package}{an optional character string specifying the name of a
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package within which to look for documentation.}
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package within which to look for documentation.}
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}
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}
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\details{
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\details{
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\code{what} can specify one of several different sources of documentation,
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\code{what} can specify one of several different sources of documentation,
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including the \R manuals (\code{R-admin}, \code{R-data}, \code{R-exts},
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including the \R manuals (\code{"R-admin"}, \code{"R-data"}, \code{"R-exts"},
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\code{R-intro}, \code{R-ints}, \code{R-lang}), \code{NEWS},
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\code{"R-intro"}, \code{"R-ints"}, \code{"R-lang"}), \code{NEWS},
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\code{COPYING} (the GPL licence), any of the licenses in
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\code{COPYING} (the GPL licence), any of the licenses in
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\file{share/licenses}, \code{FAQ} (also available as
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\file{share/licenses}, \code{FAQ} (also available as
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\code{R-FAQ}), and the files in \file{\var{\link{R_HOME}}/doc}.
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\code{"R-FAQ"}), and the files in \file{\var{\link{R_HOME}}/doc}.
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Only on Windows, the \R for Windows FAQ is specified by \code{rw-FAQ}.
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Only on Windows, the \R for Windows FAQ is specified by \code{"rw-FAQ"}.
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If \code{package} is supplied, documentation is looked for in the
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If \code{package} is supplied, documentation is looked for in the
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\file{doc} and top-level directories of an installed package of that name.
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\file{doc} and top-level directories of an installed package of that name.
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If \code{what} is missing a brief usage message is printed.
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If \code{what} is missing a brief usage message is printed.
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