B: variables? Any info?

In SU5 i see new type of variables. B:
Any one have info how to use this? Didnt find in SDK manual

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Just came across this one as well. Did you find any info? Thanks.

I made a post asking about them here as well, for the Q&A session:

This has also been discussed in devsupport, but seems pretty quiet from Asobo’s side (maybe they are still ar vacation): B input events and the SimConnect and Gauge APIs for hardware developers - MSFS DevSupport