Range (A)
Same as scene
When this option is checked the command line simulation's range is exactly the same as the one adjusted on the → timeline.
...
If you want to simulate on a certain frame range deactivate “Same as scene” and enter start and end frames.
Threads (B)
Same as scene
When enabled the number of threads is read from the scene's → “Simulation Options: General”.
Threads
Disable “Same as scene” and enter the desired number.
Args (C)
None
With this option enabled, RealFlow will perform a simulation with the current scene settings.
...