FileExists() using web-root, not absolute path...

Question

Is there a way to use FileExists() with some sort of %webRoot% system variable, rather than me having to know the absolute path in advance?  For example if my app is running on one machine where the webroot is C:\ColdFusion9\webroot\ and on another machine where it's E:\Inetpub\webroot, is there a way for me to write a single piece of code that will check for the existence of "%webroot%\webSite\myFile.cfm"?
I guess what I'm really looking for here, is a system variable called something like %webRoot% in ColdFusion 9...  Does such an animal exist?
Thanks,
Laurence MacNeill
Mableton, Georgia, USA

Answer 1

Let assume my function is contained in a .CFC file in C:\Inetpub\webroot\myapp\mycfcs
So if I used the following statement:
<cfif FileExists(ExpandPath(..\newcfcs\AttendeeInfo.CFC))>
it would return true if the file C:\Inetpub\webroot\myapp\newcfcs\AttendeeInfo.CFC existed, yes?
If that's the case, then great -- thanks!
L.