I don't understand 'system' very well. The manual says that system makes the parent process wait for completion, which sounds to me like what backticks do. If that's the case, that's not exactly parallel.
If I'm misunderstanding that and it makes it run parallel, I fail to see how i can check for feedback, as perldoc doesn't mention any return of a handle or any sort of access to information about whether the task is still running. How would i know when it's done and what its success was?