Index.php Routing Question

[eluser]codelearn[/eluser]
Hi Guys,

I'll explain really quickly what it is I want to get accomplished. Any help would be greatly appreciated:

1) I have a core CodeIgniter install sitting in my main FTP directory.
2) On 5 other FTP directories, I have the core install symlinked.

I need to be able to pass variables from the index.php of each of the 5 FTP directories that pass certain variables to the default controller.

Can anyone explain how to do this?

Thank you so much!