I'm in need of a invite system. The web page I am designing will have a password protection and the password will only be given out to a few select people. Once they are in the site I want them to be able to enter in three e-mail addresses to send invites that have randomly generated passwords which can only be used once... I have know idea how to do this and any pre-made stuff or templates. AND if it could be in PHP that would be good but it doesn't have to be.