Calling a page from root instance when multiple instances

Hi

I have 2 CF instances on my application server. One domain, same files, but 2 instances. I want to run a page from the root instances or a scope which is upper level from the instances. Because I want to apply some settings by coding to the all instances at the same time.

How can I reach the root instance or how can I call a CFC? What is the true path for root instance? Is there an alternative method to do this?