Default login popup for web sites

I am trying to build a web site with ASP.NET MVC, I'm new to this. My question is: how can I display the default login dialog? I am not referring to a custom dialog, like the jQuery Dialog, there is a default pop-up for credentials, which looks different depending on browser, same as with javascript alert(), but I don't know how to display it. To know w开发者_如何学Gohat I mean, go to http://fit.c2.com/wiki.cgi?WelcomeVisitors, there is a Login button at the bottom of the page, when you click it a pop-up appears. That is what I want to display. Any ideas?

So there is no way I can do this with FormsAuthentication?

That dialog is the result of a challenge-response authentication initiated by the server.

In the context of IIS, you would get this if you used windows authentication with no anonymous access.

You do not display this dialog or have anything to do with it other than restricting access to the resource in question.