How does an EventBean act in a cluster

We do some broadcast calls from plain Java, with an self written EventSubscriber for Event Start elements. This EventSubscriber catches an identifier and works fine in the Designer. It looks to works fine on the server as well. The EventSubscriber extends `AbstractProcessStartEventBean` which extends `IProcessStartEventBean`. Is this also works correctly when we run the server as a cluster? We expect that the event is starting just ones.