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# The Google Accounts Java API

App Engine applications can authenticate users with Google Accounts. An application can detect whether the current user has signed in with a Google Account, and can redirect the user to the Google Accounts sign-in page to sign in or create a new account. While a user is signed in to the application, the app can access the user's email address. The app can also detect whether the current user is an administrator, making it easy to implement admin-only areas of the app.

This reference describes the Java API for Google Accounts and the Users service. It has the following sections:

- Overview
- API Reference