A wiki is a "a collaborative forum where people can share ideas". If you have something to say about multivalued systems; past, present or future feel free to leave your mark. A wiki is a web site maintained for its users, by its users.
New users can register on the Preferences page.
When you login using the Login page, changes you make will be "signed" with your name. And as a free bonus available only to our preferred customers, when you create a personal page like this one Ian McGowan, contributions you make automatically link back to your personal page.
http://c2.com/cgi/wiki?WelcomeVisitors is the original wiki, though there are plenty of others on various subjects around the web.