I'm totally lost

For the moment, when my hook detects a login event, it calls my UserService class which call the eng.login() method and I get the sessionId. Like this :

I use all provided code (no SecurityManager and no LoginIntegration)
I don't know what I have to do with the sessionId to share it with KonaKart portlet. I've tried to put it in the HttpSession but i don't know where use it with the konakart portlet.
Every precise help will be appreciate. Do I have to use differents SecurityManager and LoginIntegration in my Liferay Hook and my KonaKart portlet (and so differents konakart_custom.jar) ? How to log in customer in the konakart portlet from the event in the hook ?
Sorry for all my posts
