Log in to Gallery 3 with the API

I'm trying to create a custom login page and thought I could use the API to log a user in. I have a form setup for a user to input their username/password and use the API to get the 'X-Gallery-Request-Key'... that all works fine. But I was hoping that this would actually log the user into Gallery3 as from there I just want to forward the user to their albums.

Is there someway to do this? I'm not sure if there is just some setting I'm not seeing in the admin or if there is something else I should be doing.

Thanks for any help!

Joe