text: from subprocess import Popen, PIPE
  from sys import argv
  
  server = Popen([argv[1], "server"], stdin=PIPE, stderr=PIPE)
  client = Popen([argv[1], "client", "zim", "zang", "zung"], stdout=server.stdin, stderr=PIPE)
  
  servererr = server.communicate()[1]
  clienterr = client.communicate()[1]
  
  print "-- server stderr"
  print servererr,
  print "-- client stderr"
  print clienterr,
  