Personalize login, logout, 404, and other resources

Hello,

I am using z2jh and would like to stop the user’s server upon logout. So i need to override the logout function. how can I do that?
in addition, I would like to personalize login, logout and 404 pages based on the user, i.e., pass some user’s data to these pages and render them there. how would it be possible?

best,