It's possible that I picked up that directory from somewhere else along the way.
Or, I created it and everything in it and had a complete memory lapse since. Not likely, but it makes for a good psychological thriller. Maybe I should be shutting up about now. Or or, some scripting guru *somewhere* sensed my struggle and inserted it on my drive.
Darkstar, movable-panel is a jsfx in that directory. I'm going with the first scenario of having picked it up elsewhere, as fun as the other two scenarios sound.
Back to learning and shutting up.