You
can create multiple root sites on port 80 within SharePoint 2010. This is
accomplished by creating subsequent Web applications using port 80. When this
is implemented, you do not need to configure friendly name.
The
steps to accomplish this are as follows:
1. During the Web application creation
process, specify port 80 and enter a host header name on
the creation screen.
2. Create a DNS host entry specifying
the host header name used in Step 1 as the host name. Use
the same IP address as the first host.
3. Create a new site collection using
the new Web application.
4. You should now be able to access the
new site collection using http://<host
headername>.
5. If your first Web application did
not utilize a host header, you will need to go into IIS and edit
the site binding for the initial Web site created on port 80. A binding entry
should be listed
with a blank host name. Edit that binding and enter the server name or desired
rootname
as the host.