There is a usability black hole in Moodle: A site has autologinguest A user visits a course with guest enrolment enabled The user is auto logged in as guest - they have no knowledge of this happening The user now visits a course that does not have guest enrolment enabled The user becomes confused, they do not understand the concept of having logged in as a guest, they have an account they have not logged in with but do not understand the process of logging out and in again They contact support... This plugin intervenes at stage 4 - the user is silently logged out of the guest account and redirected to the login screen.