This function is not intended to be called directly by the user. It is
  an internal-only function to prevent cluster problems while using the
  INCA algorithm in the LaplacesDemon.hpc function.
server_Listening(n=2, port=19009)This is the number of CPUs. For more information, see
    LaplacesDemon.hpc.
This is a port for server listening, and defaults to
    port 19009.
For the INCA algorithm, a server has been built into the
  LaplacesDemon.hpc function. The server exchanges information
  between processes, and has been designed to be portable. The
  server_Listening function is run as a separate process via the
  system function, when INCA is selected in
  LaplacesDemon.hpc.
Socket connections and the serialize function are used as per
  the Snow package to update a single proposal covariance matrix
  given all parallel chains. The sockets are opened/closed in each
  process with a small random sleep time to avoid collisions during
  connections to the internal server of
  LaplacesDemon.hpc. Blocking sockets are used to synchronize
  processes.