I have configured my first application in Windows Azure Active Directory and everything works fine: I can login using accounts in my directory.
However, I'm not entirely clear on all the concepts yet, especially the sign-on url. The tooltip says:
The URL where users can sign in and use your app. You can change this later.
But users sign in somewhere on login.windows.net
and furthermore, it doesn't matter what I enter here, authentication keeps working. So what is this 'sign-on url'?