...
I have enabled the root user but how do you login as root?
Or are you logged in as root by virtue of enabling?
Or are you supposed to log out then log back in?
10.8.2
Whitehill asked some valid questions, which you might have answered without appearing to take the questions personally.
As often happens here (and you even mentioned it), questions are posed to help determine the purpose - because it's a personal attack on you
well, not usually!
In this case, knowing that you can use root-level access (sudo) in the terminal, without actually enabling the root user, is usually offered as a much safer way to use your machine. If you can avoid enabling the root user (unless there's no other reasonable method), then you should continue to avoid enabling the root user. It's simply a safer way to use your Mac.
And, you are correct, it doesn't help you - if all you need is answers, and you accept the security risks of having the root user enabled.
SO - To answer your questions:
1. Log in to the root user by bringing up a login window (either by logging out of your present user, or changing to a different account if you are using fast user switching. You will see the root user account listed at the login window (with the name "Other"), and you simply log back in with the password that you set up for the root user.
2. Root user is merely enabled - you still have to log in to the root account.
3. Yes, unless you have fast user switching enabled, which will let you log in to other users, without logging out first.
and, most important of all, (you forgot to ask the question, "Should I leave the root user enabled?"
4. when the root user is no longer needed, disable the root account.
Please notice the following, if you are not too sure about the root user now.
Logging out of the root user account does NOT disable the root user - you're just logged out, but the root user is still enabled.
From your Mac help:
To ensure the security and stability of your system, disable the root user when you are not using it.