Is there a plugin to disable WordPress' default login?

I’m asking about a “shutdown” plugin, as provided here 3 years ago:

I’m posting in the Ultimate Facebook forum because its the only plugin I see that is a full replacement for WP’s default “register” and “login” functionality.

My question is: How can I “turn off” WP’s login so that the ONLY way you can login is with another login tool, like Ultimate Facebook or another plugin like BrowserID ( ) or any one or more options?

Thank you.