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.