So just a quick rundown on how this works..Database wise.
Each site is assigned a "Passkey". When viewing your site, the passkey will be passed to vHoist to say the user has visited your site. Their username and userid will be entered into vhoist, along with the site they are visiting, which now gives them access to "park" their ride on your site. This where there could be a "confirm identy" option, and I have already thought ahead for this part, thus adding the login-check.
I plan on adding the ability for Site Admin's to Add / Delete / Ban users, but again.. still adding these features as the software itself is Beta. The good news about this type of Beta is that you wont' lose your DB when upgrading!