TargetSurface..... Does anyone know the function of this advanced Command Flow?

TargetSurface…What is this in command flow?
Someone can answer me?

Hello - the F1 key will bring you to the Help file -
https://docs.mcneel.com/rhino/7/help/en-us/index.htm#commands/flow.htm?Highlight=flow
-Pascal

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Thank you very much. for helping…