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>


FROM DESKTOP:

mysql -h192.168.5.10 -umythtv -p mythconverg
Enter password:
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 177
Server version: 5.1.41-3ubuntu12.6 (Ubuntu)


FROM BACKEND:

mysql -umythtv -p mythconverg
Enter password:
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A