moving index.php file in to system folder

[eluser]Dam1an[/eluser]
[quote author="jdfwarrior" date="1240794374"]
Dam1an: He didn't say he was leaving the system folder in the web root. He just wants to have the index.php located within system. I also dont understand why he would wanna do that, but, to each his own.[/quote]

How would an index.php not as a web root act as the front controller?