cat /etc/mythtv/config.xml
<Configuration>
  <UPnP>
    <MythFrontend>
      <DefaultBackend>
<!--
Set the <LocalHostName> hostname override below only if you want to use
something other than the machine's real hostname for identifying settings
in the database.  This is useful if your hostname changes often, as
otherwise you'll need to reconfigure mythtv every time.

NO TWO HOSTS MAY USE THE SAME VALUE
-->
        <DBHostName>192.168.5.10</DBHostName>
        <DBUserName>mythtv</DBUserName>
        <DBPassword>XXXXXX</DBPassword>
        <DBName>mythconverg</DBName>
        <DBPort>0</DBPort>
      </DefaultBackend>
    </MythFrontend>
  </UPnP>
</Configuration>
root@Core:~# cat /etc/mythtv/mysql.txt
DBHostName=192.168.5.10
DBUserName=mythtv
DBName=mythconverg
DBPassword=XXXXXXXX
root@Core:~# cat /home/mike/.mythtv/
backuprc    config.xml  themecache/
root@Core:~# cat /home/mike/.mythtv/config.xml
<Configuration>
  <UPnP>
    <UDN>
      <MediaRenderer>4c619a55-178e-4b17-a4ef-028638bebe83</MediaRenderer>
    </UDN>
    <MythFrontend>
      <DefaultBackend>
        <DBHostName>192.168.5.10</DBHostName>
        <DBUserName>mythtv</DBUserName>
        <DBPassword>XXXXXXX</DBPassword>
        <DBName>mythconverg</DBName>
        <DBPort>0</DBPort>
      </DefaultBackend>
    </MythFrontend>
  </UPnP>
</Configuration>