Side tracking off thread, but amusing story nevertheless.
A factory in our group of companies I often visited in Rugeley the manager of which had a new VW Passat (mid 90s) which often when parked at work along a row outside management offices, would have unexplained open windows and sunroof (all of them) at completely random times and obviously a problem when raining. It went to the main agent numerous times but never a fault was found.
Cut to a few years later and Mrs K2 got a VW as company car and which I was named to drive. Returning one day to home, had my hands full when trying to open the house door and heard this car behind me opening all the windows. Wierd I thought, then realised I'd been clamping the key fob in one hand while trying to hold everything with this initiating the opening.
And so through experimentation found that if you blipped and held the unlock it did indeed open all of the windows. Also the lock blip used the same closes them all. You can blip and open all on a hot day before you get in, blip and close them remotely if you've got out and wanted to lock but forgot a window was open etc etc.
Tried this on any VAG passenger cars and all do it that I've tried. Also a friends ford when on holiday, and the same. Virtually no one sermed to know this though of their own car.
Funny how things work out though by accidental finding
I think now that the factory manager was probably sitting on his key in his pocket that acted depending on how far away from his office window the car was parked and if it had pressured the open or close blip.