There is a machine with Apache under win7.
If to httpd.specify conf Listen *:80 , then Apache is listening to port 80 on all interfaces you can find. If you specify a specific IP address, Listen 209.85.349.147:80, then he only listens to the correct interface, leaving the rest free (and I do from time to time).
The problem is that this IP is issued by DHCP, and rewrite every time httpd.conf — somehow not comme Il faut.
Listen 127.0.0.1:80 is not an option, because sometimes you need to access some virtual hosts to view the outside.