16 Feb 2007 at 19:39 - 2
1. Before you even log in, there should be a button that will allow you to add access keys. I have no idea where it is because I can't pull Guild Wars up at the moment, but you will need to put in your e-mail and password like normal, and then enter the key. If it's not there, you need to log into your character screen to do it, and there should be a button there.
In short, there is a button, I just can't remember exactly where it is.....
2. Yes, once you get to Lion's Arch in Tyria or Kaieng Center in Cantha, your character can emmigrate to the other country.
3. Yes, all of the characters on that account with have access to the continents and skills of both games.