System Administration is a very cut down responsibility (mainly concurrent processing and diagnostics) used for iProcurement. As such it's functions are developed as OAF pages rather than Forms.
So it is okay if I do not use it at all?
Absolutely - if you have no need for it then don't use it!
Well, my boss just ask me what is this "System Administration" task, and I can not answer any, I just said I do not use it.