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}
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}
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\value{
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\value{
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  A list containing 6 functions:
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  A list containing 6 functions:
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  \item{add}{register a callback with this manager, giving the
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  \item{add}{register a callback with this manager, giving the
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    function, an optional 5-th argument, an optional name
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    function, an optional 5-th argument, an optional name
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    by which the the callback is stored in the list,
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    by which the callback is stored in the list,
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    and a \code{register} argument which controls whether
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    and a \code{register} argument which controls whether
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    the \code{evaluate} function is registered with the internal
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    the \code{evaluate} function is registered with the internal
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    C-level dispatch mechanism if necessary.}
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    C-level dispatch mechanism if necessary.}
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  \item{remove}{remove an element from the manager's collection
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  \item{remove}{remove an element from the manager's collection
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    of callbacks, either by name or position/index.}
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    of callbacks, either by name or position/index.}
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  \item{evaluate}{the \sQuote{real} callback function that is registered
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  \item{evaluate}{the \sQuote{real} callback function that is registered
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    with the C-level dispatch mechanism and which invokes each of the
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    with the C-level dispatch mechanism and which invokes each of the
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    R-leve callbacks within this manager's control.}
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    R-level callbacks within this manager's control.}
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  \item{suspend}{a function to set the suspend state
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  \item{suspend}{a function to set the suspend state
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    of the manager. If it is suspended, none of the callbacks will be
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    of the manager. If it is suspended, none of the callbacks will be
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    invoked when a task is completed. One sets the state by specifying
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    invoked when a task is completed. One sets the state by specifying
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    a logical value for the \code{status} argument.
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    a logical value for the \code{status} argument.
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  }
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  }