Where is the data for the Loginbar located?

[Infernette]

Okay this thing has been giving quite a few of my users trouble, since if you aren't on the index it will redirect you to a non-existent page that is relative to the page you are on, causing it to not work and thrown an error. I have been trying to find where the actual code for the login bar is located in the files, but it has been to no avail- can anyone point me in the right direction so I can modify the page it goes to. :P

It's not in the db or editable in the modules part of the admin control panel, I've even tried editing the class_sidebar to just exclude it and use my own but that throws an error, I have no idea where this thing is.