How can I use the Audi A8 key fob to start the car remotely?

I recently purchased an Audi A8 and noticed that the key fob has a small button with a 'flag' icon on it. What does this button do and how can I use it to start the car remotely?

The 'flag' button on your Audi A8 key fob is actually the remote start feature. To use it, press and hold the button for a few seconds until the car starts. This is especially convenient during colder weather when you can start your car from the comfort of your home.