Apache file of Root Directory

Apache file of Root Directory

I want to write a new index.html located in C:\AppServ\www, providing
auto-direction to another page in C:\Appserv\www\xxx. That means when
visitor connects to server with IP 192.168.x.x, he will be redirected to
C:\Appserv\www\xxx\index.html (192.168.x.x\xxx) but not C:\Appser\www.
But I found that causes me unable to access to the root directory list of
Apache C:\Appserv\www.
I wonder what is the file to show the root directory list when I connect
to localhost?
Is there any file name like index.html in Apache manages that representation?