Richard,
First of all, thank you for taking the time to help me. I can only imagine how much of your time is taken up, gratis, helping others. When people know that you know how to fix computers, it's almost as bad as when people know you have a pickup. They always want to borrow it to haul stuff -- and they could give you a full-time no-pay job fixing computers.
I didn't know how to attach a file while responding in this forum, so below is the full text of my httpd.conf file. AFter a quick scan, I don't see anything obvious which would be a security risk, but I am still quite wet behind the ears.
I had a volunteer parent who works daily with Apache and programming, etc., do the basic set-up for me. He is not often available, leaving me to fend for myself -- but that's the way I learn. I'm eager to find out about "DirectoryIndex directive."
FOCUS-SIS and MOODLE are on the same server "stpb00." When I type in http://stpb00/index.php, I get the FOCUS SIS login screen. But when I type in http://stpb00/moodle/login/index.php, the place where the Moodle index.php file is located, I get "The webpage cannot be found."
My error is probably obvious to you . . .
(Interesting logo for your profile -- an infinity thermostat?) 
Joel
(Edited by Helen Foster - content deleted by request from Joel - original submission Thursday, 18 October 2007, 07:58 PM)