resource cs4()
  optype results_type = ()
  op request(cap results_type results_cap)
  const int N = 20  # number of cleint processes
  process client [ i = 1 to N ] {
    op results_type results
    send request(results)
    # possibly perform some other work
    receive results()
  }
  proc request(results_cap)  {
    # handle request
    send results_cap()
  }
end