Constant Running Configuration

Constant Running Configuration

I would like to have my configuration run constantly on an AD Group so if a new computer is added, it will get this software.
If I have a configuration targeted to an AD group, would it not have a status of completed after it has pushed to all the computers in that AD group? Meaning if I add a computer to that AD group a month from now, that configuration would be completed and "executed" and would not run on that new computer.
Will the configuration only target to the computers that were in the group at the time I pushed the configuration, or will it add them as more computers are added and the configuration is running?

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