#. Open two terminals inside the directory with the HelloWorld files.
#. In the first terminal, start the subscriber by running ``HelloWorldSubscriber``.

   .. tabs::

       .. group-tab:: Linux

           .. code-block:: console

               ./HelloworldSubscriber

       .. group-tab:: macOS

           .. code-block:: console

               ./HelloworldSubscriber

       .. group-tab:: Windows

           .. code-block:: console

               HelloworldSubscriber.exe

#. In the second terminal, start the publisher by running ``HelloWorldPublisher``.

   .. tabs::

       .. group-tab:: Linux

           .. code-block:: console

               ./HelloworldPublisher

       .. group-tab:: macOS

           .. code-block:: console

               ./HelloworldPublisher

       .. group-tab:: Windows

           .. code-block:: console

               HelloworldPublisher.exe


``HelloworldPublisher`` appears as follows:

.. image:: /_static/gettingstarted-figures/helloworld_publisher.png


``HelloworldSubscriber`` appears as follows:

.. image:: /_static/gettingstarted-figures/helloworld_subscriber.png