New to character devices

From: Kalani (kalani_at_keala.no-ip.com)
Date: 02/22/05 

Date: 21 Feb 2005 15:32:38 -0800

I need to open a file in an existing application, but that file must be
altered realtime before it gets to the application. I was wondering if
this could be accomplished with a virtual character device. In this
case, the device would have to be passed two parameters. Is that even
possible?

Thanks in advance for any help anyone can provide.