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Data for Machines and Events
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Both machines and events can have associated data.  To explore the topic, we'll revisit :ref:`the-hsm-communicator`,
adding a place in the machine to hold the most recently received peer message, and giving the MESSAGE_RECEIVED event
a way to actually convey that message.

.. toctree::
	:maxdepth: 2

	machinedata
	eventdata

	Source/sourceindex