R6

R6 / Mc:Mc-1

System Interaction targets zero, one or many Actor

Actor is the target of zero, one or many System Interaction

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An interaction may be directed at multiple receivers, destinations, or as we're calling them, 'targets'.

Here's an example where multiple such targets are specified in a System Interaction:

EVMAN ~|| UI, SIO : Door<S1> [ OPENING ]

Here the source Actor is the EVMAN:Door<S1> instance which notifies both the UI and SIO domains, each a Target Actor that the OPENING state has been entered. In this case the Action Type is bridgeable condition state entry or implicit notification state entry or some such name.

Not all actions have receivers. For example, if we had instead specified the System Output as:

Door<S1> [ OPENING ]

We are simply specifying a condition. It occurs and is of interest to the debugger, but it is not directed to any particular destination.