Right, read the first part of the thread, but can't be arsed to read the rest, because I know the answer for sure (So apologies if it's been posted).
The little button on the B Pillar disables the interior volumetric alarm, but that's all. The bonnet, boot etc stays armed.
If you press the button on the key fob to lock the car, and then press it a second time within one second of the first press that completely DISABLES all the alarms - you can tell when this has happened by the little red LED not flashing on the driver's door.
A while back there was a loose connection on the boot, that made the "Boot open" light come on, on the dash and it kept setting the alarm off. Using the button on the B pillar still had the alarm going off, but pressing the lock button on the key fob twice to disable the alarm, stopped it from going off.
I have a MY02 Leon Cupra, and I'm sure that it is described in the manual (My version anyway!). That's where I read about the two presses of the key fob having to be within 1 second of each other.
Hope that clears things up a bit,
Stevo