Microsoft Cognitive Services: Face API Subscription Key and Location region

Hi,

I am trying out Cognitive Service Face API. I've subscribed as Free trial version. 

After subscription, I got into the profile page, where I have all the API's services that subscribed.

Now, I have endpoint, key1 and key2.

I have following clarifications:

1. keys are associated with particular endpoint, which means I cannot use this key for any other endpoint.

2. What is purpose of having 2 keys ?

3. Is there any way to get list of available location endpoints ?

Thanks