DNS Name to portal (short) URL

Hi folks,

we are going to integrate some webapplications via url-iview in our portal (2004s). The applications have there own dns-name within our domain-dns-server.

After the integration, my plan is that the dns will be resolved into a portal (short)URL. In IIS i can take the hostheader for this, but how is it possible in the portal?

best regards

Frank