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Once things are set up, you pull down "run" and do "start". You'll see a number in the upper right showing how many threads exist and how many are active. It ought to start out 10/10 (or however many you set up), and quickly go down to 0/10. It will almost certainly hang at 1/10 or 2/10, at least if you do it a few times.
Resources
SAK-7732