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  }
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  }
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  Function \code{makeForkCluster} creates a socket cluster by forking
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  Function \code{makeForkCluster} creates a socket cluster by forking
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  (and hence is not available on Windows).  It supports options
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  (and hence is not available on Windows).  It supports options
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  \code{port}, \code{timeout} and \code{outfile}, and always uses
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  \code{port}, \code{timeout} and \code{outfile}, and always uses
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  \code{useXDR = FALSE}. See \code{\link{mcfork}} for the inadvisability of using
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  \code{useXDR = FALSE}. It is \emph{strongly discouraged} to use the
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  the \code{"FORK"} cluster with GUI front-ends and multi-threaded libraries.
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  \code{"FORK"} cluster with GUI front-ends  or multi-threaded libraries.
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#ifdef unix
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  See \code{\link{mcfork}} for details.
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#endif
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  It is good practice to shut down the workers by calling
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  It is good practice to shut down the workers by calling
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  \code{\link{stopCluster}}: however the workers will terminate
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  \code{\link{stopCluster}}: however the workers will terminate
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  themselves once the socket on which they are listening for commands
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  themselves once the socket on which they are listening for commands
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  becomes unavailable, which it should if the master \R session is
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  becomes unavailable, which it should if the master \R session is