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  Any Unicode character can be entered into a text string \emph{via} a
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  Any Unicode character can be entered into a text string \emph{via} a
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  \samp{\\uxxxx} escape, or used by number in a call to
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  \samp{\\uxxxx} escape, or used by number in a call to
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  \code{\link{points}}.  The \code{\link{windows}} family of devices can
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  \code{\link{points}}.  The \code{\link{windows}} family of devices can
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  display such characters if they are available in the font in use.
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  display such characters if they are available in the font in use.
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  This can often be used to display Greek \emph{letters} in bold or italic.
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  This can often be used to display Greek \emph{letters} in bold or italic.
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  A good way to both find out which characters are available in a font
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  A good way to both find out which characters are available in a font
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  and to determine the Unicode number is to use the \sQuote{Character
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  and to determine the Unicode number is to use the \sQuote{Character
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  Map} accessory (usually on the \sQuote{Start} menu under
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  Map} accessory (usually on the \sQuote{Start} menu under
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  \sQuote{Accessories->System Tools}).  You can also copy-and-paste
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  \sQuote{Accessories->System Tools}).  You can also copy-and-paste
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  characters from the \sQuote{Character Map} window to the \code{Rgui}
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  characters from the \sQuote{Character Map} window to the \code{Rgui}