Nothing will change in regards to dcrctl (other than not using the --testnet flag, of course).



Those repos are just helper packages used throughout the code. For example, dcrwallet makes use of the dcrrpcclient package in order to communicate with dcrd.



EDIT: I should also note dcrrpclient is extremely useful for 3rd party developers that are wanting to write code that interfaces with dcrwallet/dcrd programmatically since it handles a lot of the "grunt work" so to speak. The documentation in the repo describes that in much more detail.

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