WordPress MU

Essentially, I'm finally tired of searching. I have a site that has wpmu installed within a subdomain (subdomain.domain.com). I want to be able to "show a blog" or at least "who is logged in" on my home page (www.domain.com). I've heard you are supposed to call wp-header.php, but it doesn't seem to be working from the sub domain.

For Example:
require('/usr/local/psa/home/vhosts/domain.com/httpdocs/subdomain.domain.com/wp-blog-header.php');

Gives me:
No WPMU site defined on this host. If you are the owner of this site, please check Debugging WPMU for further assistance.

Basically I need to figure out how to define it or connect to the database to show user details on my http://www.domain.com from the wordpress folder that is located at subdomain.domain.com

I hope this makes sense... I cannot figure it out.

Merci Beaucoup!

You only call the header if you're trying to integrate that page to look like the rest.

If the results of what you want are spewed out into a file, you could then use a php include statement to pull what you wanted onto the main page.

Okay. I don't need the look, what I need is to display the current user that is logged in on a page outside of the wordpress install.

Like I have wordpress installed here:
http://www.mydomain.com/wordpress/

My HOMEPAGE meaning my site HOMEPAGE not wordpress is:
http://www.mydomain.com/index.php

I would like to establish some sort of connection with wordpress that would show the logged in WORDPRESS user on my homepage.

I know how could make a form to submit the user information, that's easy enough, just setup a form. What I need is to actually show the logged in wordpress user on my site homepage (http://www.mydomain.com/index.php).

Does that make sense?

Yeah, it makes sense, I just don't know how you'd do it. :) If it was just static info or whatever (like a list), an include would do. Login status, I think, would be harder.

(and by include, I mean a php include statement.)