Generating session externally (bbsessionhash cookie and session table)

[Analogpoint]

Why don't you do this.

1. Copy the login form HTML from the navbar template.
2. Replace all the variables ($vbphrase etc), with plain text
3. Add the absolute url to /clientscript/vbulletin_md5.js to make sure it gets included.
4. Add the absolute url to the form's action 'login.php?do=login'

You're done, it'll log you in and redirect you back to where you were.