hwserver	pbdZMQ	Hello World server.
hwclient	pbdZMQ	Hello World client.
wuserver	pbdZMQ	Weather update server.
wuclient	pbdZMQ	Weather update client.
taskvent	pbdZMQ	Parallel task ventilator.
taskwork	pbdZMQ	Parallel task worker.
tasksink	pbdZMQ	Parallel task sink.
msreader	pbdZMQ	Multiple socket reader.
mspoller	pbdZMQ	Multiple socket reader using poll method.
mspoller2	pbdZMQ	Multiple socket reader using poll2 method.
mpserver	pbdZMQ	Hello World server in multiple part version.
mpclient	pbdZMQ	Hello World client in multiple part version.
iter_next	pbdZMQ  "source('iter_next.r')" or "Rscript iter_next.r".
iter_try	pbdZMQ  "Rscript iter_try.r".
