Webpage access conditional to registration
 

Would it be possible to get someone to write a script that wouldn't allow visitors to view a webpage unless they were registered on the web board?

I would see maybe a bit of .php code placed on any page I wished to protect. It would call a script which would check the cookie for registration and if they weren't registered, offer them the opportunity to register to see the page.

Am I dreaming or could this be done?

Yes it could be done, please check for the Modifications Hints and Tips forum, there're articles how to make your own vbulletin pages (that can be used to check if a user is registered).

Good luck.