non backdriveable means that you cannot physically move it (in either direction). Only the motor can move it. One way to do this is with a worm drive (although worm gears with pitch larger than ~10% can be backdriven).
Here is more info on the window motors (found by searching CD):
Quote:
The anti-backdriving capability of those motors is awesome, so we try to use it to our advantage. Modifying the motor is just not allowed within the rules.
I know you don't want to argue the point, but I just can't help myself. The seal drag and other resistive forces are nothing compared to the weight of the window. Even though the window is going down, gravity is still acting on the motor (just helping). The motor's backdriving resisistance (or the linkages' backdriving ability) allows the window to stay up when the motor is off. The second the motor starts to move, the backdriving ability of the worm is greatly reduced (sliding friction vs. static friction) and gravity actually pulls the window down and the motor just controls the fall.
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