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    system.  If \code{NA}, the server is started if not already running.}
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    system.  If \code{NA}, the server is started if not already running.}
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}
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}
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\details{
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\details{
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  This function starts the internal HTTP server, which runs on the
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  This function starts the internal HTTP server, which runs on the
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  loopback interface (\code{127.0.0.1}).  If \code{options("help.ports")}
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  loopback interface (\code{127.0.0.1}).  If \code{options("help.ports")}
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  is set to a vector of integer values, \code{startDynamicHelp} will try
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  is set to a vector of non-zero integer values, \code{startDynamicHelp} will try
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  those ports in order; otherwise, it tries up to 10 random ports to
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  those ports in order; otherwise, it tries up to 10 random ports to
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  find one not in use.  It can be disabled by setting the environment
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  find one not in use.  It can be disabled by setting the environment
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  variable \env{R_DISABLE_HTTPD} to a non-empty value.
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  variable \env{R_DISABLE_HTTPD} to a non-empty value or \code{options("help.ports")}
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  to \code{0}.
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  \code{startDynamicHelp} is called by functions that need to use the
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  \code{startDynamicHelp} is called by functions that need to use the
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  server, so would rarely be called directly by a user.
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  server, so would rarely be called directly by a user.
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  Note that \code{options(help_type = "html")} must be set to actually
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  Note that \code{options(help_type = "html")} must be set to actually