Server Level and Application Level Configuration Files in OAS

I was editing, using, sometimes digging these files but it is really useful to have them all listed like this.
I found it really useful especially when you knew to edit this xml file but not sure where it was or how to do it.
Here is the documentation from Oracle Technology Network Documentation:
http://download.oracle.com/docs/cd/E12524_01/web.1013/e12288/confdesc.htm
Enjoy!