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    Typically this argument is not specified, and one uses \code{add} to
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    Typically this argument is not specified, and one uses \code{add} to
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    register callbacks after the manager is created.}
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    register callbacks after the manager is created.}
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  \item{registered}{a logical value indicating whether
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  \item{registered}{a logical value indicating whether
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    the \code{evaluate} function has already been registered
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    the \code{evaluate} function has already been registered
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    with the internal task callback mechanism.
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    with the internal task callback mechanism.
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    This is usually \code{FALSE} and
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    This is usually \code{FALSE} and
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    the first time a callback is added
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    the first time a callback is added
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    via the \code{add} function, the
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    via the \code{add} function, the
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    \code{evaluate} function is automatically registered.
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    \code{evaluate} function is automatically registered.
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    One can control when the function is registered
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    One can control when the function is registered
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    by specifying \code{TRUE} for this argument
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    by specifying \code{TRUE} for this argument
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}
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}
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\seealso{
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\seealso{
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  \code{\link{addTaskCallback}},
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  \code{\link{addTaskCallback}},
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  \code{\link{removeTaskCallback}},
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  \code{\link{removeTaskCallback}},
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  \code{\link{getTaskCallbackNames}}\\
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  \code{\link{getTaskCallbackNames}}\\
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  \url{http://developer.r-project.org/TaskHandlers.pdf}
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  \url{http://developer.r-project.org/TaskHandlers.pdf}
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}
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}
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\examples{
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\examples{
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# create the manager
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# create the manager
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h <- taskCallbackManager()
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h <- taskCallbackManager()
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