Originally Posted by Fizzlemizz
The addon can't communicate but the only way for an external program to extract the latest information from an addons SavedVariables file(s) is after /reload or logout/exit.
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I got the idea from the well known TSM addon, where, I presume, an external application writes to the saved variables file, to be read later by the addon itself. So the communication can be two ways, albeit with the /reload in between.
I have also noticed many times that WoW loses character settings if you do not log out but crash out/lose connection, which also follows the same "save files on /reload" rule...