I am creating an app which requires user authentication so that each
person can login to their own "private" area. The default Users
service should suit my needs; however I have a quick question to
ensure I have understood how it works correctly.

To check whether someone is logged in you do the following:
User user = userService.getCurrentUser();

If the user object is null - the user is not logged in
If it is not null, the user has been logged in.

To get the unique identity of the user you use:
user.getNickname()

Now, is it okay to just use this identifier to fetch the stored data
for this user or is there another way?

Second question, is their another "off the shelf" method to
authenticate users without using the App Engine users service -
something which I could implement into my site design and not have to
redirect to the Google Accounts login page?

Many thanks!
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