resource cs3()
  optype results_type = ()
  op request(cap results_type  results_cap)
  const int N = 20  # number of client processes
  process client [ i = 1 to N ] {
    op results_type results
    send request(results)
    # possibly perform some other work
    receive results()
  }
  process server  {
    while (true) {
      cap results_type  results_cap
      receive request(results_cap)
      # handle request
      send results_cap()
    }
  }
end