Managing updates and versions

Hi,
I have a question about managing happ updates and versions in holochain ecosystem.
If I switch to a new version of an HApplication, how can I be able to communicate with other agents who still have a lower version? Also, what happens to the data history (old version of DHT and Source chain)?
Thanks

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maybe you’ll get pinged on this anyways, but I made a response to a super similar question here: Updating the source code is going to create a new chain? - #2 by Connoropolous

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