Want to get userid outside of forum

[sof-guild]

I have a separate standalone PHP/MySQL app for my forum, and use the forum member's userids to check for access rights. This works fine if the user has checked "remember me," as I can simply pull the cookie, but if they haven't done so they aren't getting access. Is there a way I can retrieve the userid from the session to validate these members? It's all on the same domain, so that shouldn't be an issue.

[nico_swd]

include('./forum_path/global.php');

echo $vbulletin->userinfo['userid'];