The person that initiates a case by by the given process is called; an actor
Dataflow is simply defined as the movement of data through a system comprised of software, hardware or a combination of both.
Now, in data flows, there are different types of functions or processes. However, the one in question specifically talks about initiating a use case by requesting the system to perform a function or process.
The person that does the above task is called an actor.
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