Windows 7. I plugged in a keyboard that my wife picked up at a grab pile. Shortly after booting with it connected, I noticed a new task running - an install screen for 'Razer Synapse'. (The keyboard turns out to be a 'Razer [something]'.) I closed this window, and did not do anything to install it. However, Task Manager showed a couple of Razer-named tasks running, and msconfig showed at least one Razer-named service running.
Question: can a (USB) keyboard install software on its own?
(Some really bad things happened after that. I will leave that for another post.)