vbulletin external page

[shellcode]

Hi,

We have a portal and we want vbulletin 5 entegration to our portal (username, online users, last topics and sessions{username etc.}...)

What should you do?

We should use Api or anything?

Which use include code for my header page?

I used this code in my header.php;

$root = $_SERVER['DOCUMENT_ROOT'];
$curdir = getcwd ();
chdir("$root/forum/");
require("$root/forum/core/global.php");
chdir ($curdir);

and i try

$vbulletin->userinfo['username'];

but:
"Access denied."

can you help me?

Thanks..