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The custom string isn't going into effect for me, though, even after a restart of the instance.
I've tried both "Company representative {0} is accessing your computer." and "{0}" without it kicking in.
Heh, support told me it wasn't a configurable string. Mea culpa.
Customer support service by UserEcho
Ahh, it's part of the actual install, so it isn't retroactive / pulled from the instance.
Good enough for now, really only care about it for our Ad Hocs at the moment.