ADFS 2012 R2 Login prompt Appears again and again for same user on different application

Hi Guys,

I have followed following sample for oAuth2.0 SSO

http://www.cloudidentity.com/blog/2013/07/30/securing-a-web-api-with-windows-server-2012-r2-adfs-and-katana/

If we got the OAuth token for one application can we authenticate the same user using a second application and at this time should login prompt appears?

If login prompt appears it mean it deviates from the SSO behavior, where user don't need to enter the password again even the session is not same? AM I right?

If we want to implement this behavior where login prompt should not appear how we can achieve this? Can we use the access token to authenticate the same user? :(