What indicates the end of a synchronous invoked behavior?

The identification of a reply message as the indication of the end of a synchronous invoked behavior is rooted in the fundamental principles of interaction in modeling. In synchronous messaging, the sender waits for a response (the reply) before moving on to the next task. This reflects a direct relationship between the request (the invoke) and the response (the reply), where the completion of the synchronous operation is marked by the receipt of the reply message. It signifies that the invoked behavior has been executed and that the control can now return to the invoking process.

This dynamic is essential in processes where timing and order of operations are crucial, ensuring that actions occur in a defined sequence. In scenarios involving synchronous operations, the flow can only proceed once the expected reply has been received, solidifying the importance of the reply message in indicating the end of the invocation.