Changing the host.domain once R12 is installed..

Hello all,
We installed R12 on a brand new machine (named localhost.localdomain). It installed fine and we were able to get to it by http://<ipaddress>:8000. The system administrator wants to change this to <XYZHOST>.<ABCDOMAIN>. What do we need to ensure that the app still functions correctly?
We have changed /etc/hosts
127.0.0.1 <XYZHOST>.<ABCDOMAIN>
and am able to ping by name and Ip.
We are having no problem logging and looking at the JSP pages of R12. The forms however are not cooperating at all :). Any ideas/suggestions will be greatly appreciated.
Thanks
Sury

We have changed /etc/hosts
127.0.0.1 <XYZHOST>.<ABCDOMAIN>keep this as before and add new line with your ipaddress and your hostname.domainname then follow mdtaylor insractions
ip_address hostname.domainname
fadi

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