[Ipstenu (Mika Epstein)]

For example, where is WordPress “auth” cookie salt in WPMU? I also can’t find WordPress “secure auth” cookie salt & WordPress “logged in” cookie salt in my WordPress admin page.

You just listed them.

The WordPress “auth” cookie salt in WPMU is in your wp-config.php file: define('AUTH_SALT', 'bliddyblah');

If you’ve done that correctly, you should see something like this: http://img268.yfrog.com/img268/8247/bbpresssettings.gif

I wiped out my cookies and URL, but you should get the idea.