Auto Shutdown of Oracle Needs Lock File in /Var/Lock/Subsys

This problem is resolved but I'm not clear why/how. I installed Oracle Standard 10.2 on Red Hat Advanced Server 4. When rebooting the server, automatic startup of Oracle works, but automatic shutdown does not after following instructions in Oracle Database Administrator's Reference 10g Release 2 for UNIX-Based Operating Systems, section 2.2.2. Turns out that the following command(s) have to be added to the Oracle startup script /etc/rc.d/init.d/dbora to create a file in /var/lock/subsys.  

       su - $ORA_OWNER -c $ORACLE_HOME

        touch /var/lock/subsys/dbora  

Can anyone explain to a Linux newbie why the file has to be added to that folder and how the Linux start/stop procedure uses it? Thanks!

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