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# The Users Go API

App Engine applications can authenticate users who have Google Accounts, accounts on your own Google Apps domain, or OpenID identifiers. An application can detect whether the current user has signed in, and can redirect the user to a sign-in page to sign in or create a new account. While a user is signed in to the application, the app can detect whether the current user is an administrator, making it easy to implement admin-only areas of the app.

This reference describes the Go API for the Users service. It has the following sections:

- Overview
- Reference