RTD/TDN Work Flow

Hey I was wondering how most shops are using RTD/TDN in their work flow. 99% of my shop is dyno tuning. I suppose my main questions are if you sell an RTD to a customer you've previously tuned, do they have to buy their own licenses to relicense the tune for their interface? Is using the phone app required to tune with the RTD or can we use VCM Suite and flash with the RTD on the dyno? I can see how it all works with remote tuning but I'm just trying to figure out how it all works with dyno customers and the license requirements between the shop's MPVI3 and the sold RTD. Thanks!