"subprogram_ports" example:
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* Description: one driver node (Driver) sends event [data] one of the
  others nodes (Receiver_1 and Receiver_2) or to both of them, depending
  on the out ports raised by its called subprogram (Do_Drive). One of
  the two followers (Receiver_2) contains 2 threads and the second may
  be triggered by an OUT port of the first.

* Compilation: issue "make" in the root directory

* Run: launch 'receiver_1', then 'receiver_2' and finally 'driver'.

