use same login from vbulletin

[Kitek]

I have found so far to require once global.php in my files and the $vbulletin->userinfo['insert info needed]; to obtain the users information. I did something similar to this with phpbb3 before I purchase vbulletin. I have multiple custom pages and sites I made for my website that integrated the logins so that everything used the same login. I am trying to find a list of all of those class variables that are used in vbulletin so that I can convert my sites to use the new vbullettin 4.

$vbulleting->userinfo['userid']

Im looking for the entire list with descriptions. I am sure it exists here but my searches come up short of what I am actually looking for. Does anyone have a thread or link of this information already found? I am also looking to compare password to access these sites so that they share the same username and password.