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  A character vector giving the name for each of the
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  A character vector giving the name for each of the
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  registered callbacks which are invoked when
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  registered callbacks which are invoked when
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  a top-level task is completed successfully.
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  a top-level task is completed successfully.
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  Each name is the one used when registering
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  Each name is the one used when registering
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  the callbacks and returned as the in the
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  the callbacks and returned as the in the
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  call to \code{\link{addTaskCallback}}.
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  call to \code{\link{addTaskCallback}}.
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}
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}
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\note{
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\note{
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  One can use \code{\link{taskCallbackManager}}
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  One can use \code{\link{taskCallbackManager}}
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  to manage user-level task callbacks,
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  to manage user-level task callbacks,
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  i.e., S-language functions, entirely within
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  i.e., S-language functions, entirely within
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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{taskCallbackManager}}\\
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  \code{\link{taskCallbackManager}}\\
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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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 n <- addTaskCallback(function(expr, value, ok, visible) {
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 n <- addTaskCallback(function(expr, value, ok, visible) {
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                        cat("In handler\n")
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                        cat("In handler\n")
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                        return(TRUE)
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                        return(TRUE)