I'm also in IT and also using a jiggler.. lol. My jiggler shows up as a mouse in device manager. So that's why I ask the question. I switch my thunderbolt connection to another machine, so OS will just see a mouse disconnect/reconnect basically...
Unless they're monitoring my screen and seeing the mouse go one pixel up then down, I don't know how they accomplished it. Maybe by monitoring at an OS level which applications are in focus and for how long? How many key presses/mouse clicks in a certain time period?