BuddyPress.org

Wow. 30 minutes with no reply and you’re already bumping the thread?

wp_create_user ($username, $password, $email) is the right direction. Take a look at the wp-fb-autoconnect to see the calls to create new users. Then, do a search for having the BP top bar appear on external sites. I’m not 100% sure, but it seems like the same way you can get the BP bar to appear on other pages you could tie into other WP functions like the wp_create_user () function. Basically requires you to include/require some WordPress files on your external page that’s making the calls. I can’t remember which.