One-handed operation in my 2005 Roadster Limited. Never noticed any button until today...and as with prior posts...it doesn't move, doesn't appear to do anything. I'm not even really sure that it's a button at all...just a hinge cover for the twist handle. I pull the handle down and give it a turn, the windows roll down, I push the top up to he first stop, and then hit the lowering button. I wish this had a press once past the first detent for the automatic lowering feature...but no...it's a press and hold. Rats!