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This document provides a tutorial on creating a simple login/logout application using Grails. It discusses creating a Grails application and User controller. It describes customizing the login page view and adding a login form. It then covers creating the login action to handle form submission, adding validation, and using flash scope to display messages. The tutorial also demonstrates keeping the login status in the session, creating a logout action, and conditionally displaying the login form or logout link based on login status. Styling and other Grails resources are also briefly mentioned.