Finding the webroot on File server

I'm using coldfusion and cffile.  I need to find out the root path to the server D:\webroot path....  Can I find that out using a script I invoke on the web server?  I need to get it fast and the host company is hard to work with.

Here's an example of the path I used with a different host:

<cfset yourdirectory = "D:\web\domain\lsession\pa\#client.userid#\">

Start Free Trial