I don't have any information about the precise trigger mechanism--just that
it "relates"--which information comes from a post from Steve Dodson of
Microsoft. So far, no evidence belying this connection has come forth.
So--I can't tell you what the trigger is, just that if you didn't have FUS
or Remote Desktop or Remote Assistance enabled, and probably actually in
use,. it wouldn't happen, and that there is no intentonal significance to
the change.