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  evaluation frame of the function when it exits (including during
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  evaluation frame of the function when it exits (including during
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  standard error handling).  Thus any functions or variables in the
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  standard error handling).  Thus any functions or variables in the
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  expression will be looked for in the function and its environment at
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  expression will be looked for in the function and its environment at
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  the time of exit: to capture the current value in \code{expr} use
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  the time of exit: to capture the current value in \code{expr} use
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  \code{\link{substitute}} or similar.
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  \code{\link{substitute}} or similar.
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  This is a \sQuote{special} \link{primitive} function: it only
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  This is a \sQuote{special} \link{primitive} function: it only
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  evaluates the argument \code{add}.
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  evaluates the argument \code{add}.
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}
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}
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\value{
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\value{
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  Invisible \code{NULL}.
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  Invisible \code{NULL}.
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  Wadsworth & Brooks/Cole.
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  Wadsworth & Brooks/Cole.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{sys.on.exit}} which returns the expression stored for use
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  \code{\link{sys.on.exit}} which returns the expression stored for use
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  by \code{on.exit()} in the function in which \code{sys.on.exit()} is
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  by \code{on.exit()} in the function in which \code{sys.on.exit()} is
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  evaluated.
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  evaluated.
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}
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}
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\examples{
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\examples{
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require(graphics)
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require(graphics)
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opar <- par(mai = c(1,1,1,1))
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opar <- par(mai = c(1,1,1,1))