Simple as:
Get-Counter -Counter '\web service(_total)\current connections'
You can also use performance Monitor utilizing the same filter/”counter”.
To view all filter/”counter” types: (*note a lot of output, may want to pipe to file)
typeperf -qx
This is useful info if you plan on making Site Changes and need to know how many people might be affected. At the time of this writing I haven’t been able to figure out WHO these connections belong to, however I believe with more knowledge this might be possible. I’ll leave this open for the time being, and come back to it when time permits.