Guys, I'm new to these high tech keys and have a couple questions: 1. If the batteries die, does the key lose its programming? 2. What's the red button on the side for? 3. I've only got the one key, what's the best way to get another? Dealer? Local locksmith? 4. Can you program the key yourself or does the dealer have to do it? TIA, Tony 2001 A4 Avant quattro 2.8