Apache defaults to using /usr/local/apache/conf/httpd.conf, but this can be changed at will.
Use this command in a shell: ps -edaf|grep http
That should give you a listing of all httpd server processes that are running.
If you are lucky you will see that the httpd\'s are called with a \"-f\" parameter.
something like:
/usr/local/apache/bin/httpd -f /usr/local/apache/conf/httpd.conf
This tells the httpd where to find it\'s config file.
That file is the one you need to edit.
You can also have a look (with a file viewer, NOT an editor) at the startup script for the httpd.
On linux that\'s usually /etc/rc.d/init.d/httpd
And on solaris /etc/init.d/httpd
Don\'t change that file, there if there is no need to, or you could mess up your webserver very nicely.
You will find a \"httpd\" command in there too.
good luck