there is a true rife set called "run me first" or something like that, available at http://www.electroherbalism.com.
using this set, you are instructed to note "hits" giving you some idea of where you might want to start.
Tizona had given a Truerife site, where you can download the frequencies. Scroll down on the left side, where it says F100. Because I have a disc stuck in my computer, I couldn't use the disc that comes with the F165, and I downloaded this same thing off of the http://www.atelierrobin.net
site.
This is from the website link that John provided, I found it a while ago and it helps to let you know what you might have: they say "watch for the hits"