Cameo Simulation Toolkit Magic Model Analyst allows you to specify whether Forks in Activity Diagrams run in a parallel or sequential way during simulation. You can change the behavior of an individual Fork by adding a constraint with a hardcoded keyword (sequential or parallel). If a Fork is set to run in parallel, all outgoing edges from that Fork run simultaneously. If a Fork is set to run sequentially, only one outgoing edge from that Fork can run at a time.
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