Next you need "port forwarding" of http requests for your domain to your own httpd (so that you don't need to use addresses like http://www.siebengang.net:8880/index.html, but http://www.siebengang.net/index.html gets "mapped" to port 8880). In the domtool setup for http://www.siebengang.net/ this looks like
domain "siebengang.net" with (* NS/DNS/Mail stuff omitted *) web "www" with proxyPass "/" "http://bog:8880/"; proxyPassReverse "/" "http://bog:8880/"; end; end;
That should be about all you need...