Please help. Confusing doubt regarding httpd.conf.

Hi,

I was searching for configuration directives for mpm event module on my server. I found the directives for this module (bearing different values) at two files.

1) One sounding like pre_virtual_host_global.conf in apache/includes directory.
2) Other one sounding like httpd-mpm.conf in apache/extra directory.

Please someone can help me understand what is the difference between these two files. Also please someone can tell me which one overrides the other.

Thanks,
Kamalkk