how to change default vhost
 

I am trying to isntall a feature on one of my sites, that requires this specific vhost to be the default vhost.
how would I make one out of a dozen vhosts the default one?

Maybe I am wrong, but I believe you can set specific vhosts parameters in apache directives in control panel.

There is no such thing as a default vhost in ISPConfig. All vhosts are equal and name based.

well, here is the link to the plugin: http://wordpress.org/extend/plugins/.../installation/

and the exact text:
I guess what they mean by default vhost, is the vhost that gets called if none other fits!? does that make more sense?
I.e. a domain points to this server and then you delete it from the server but the DNS still points here, so where do you land when accessing this domain?

Do you want to redirect subdomains of a domain or different domains to your wordpress installation?

I am playing with wpmu, thats what wordpress.com is using. with this plugin, people can sign up for i.e till.mydomain.com and redirect their own domains i.e. till.de to till.mydomain.com and my wpmu isntallation will catch this so you use your own domain i.e. till.de but use my services at till.mydomain.com.

does that make sense to you? I tried the long explanation, but your one sentence could also be simply answered with YES :-)

That's the "Shared-IP" vhost - it's the first one on Vhosts_ispconfig.conf.

yes I understand, but how do I make another vhost the "default" one?

You can not make another vhost the default one without changing the ispconfig source code.

You could place that vhost manually in your main Apache configuration, right before the file Vhosts_ispconfig.conf is included.