Hi Ray
If I am at a new site, I will start out with an advanced programs that I have loaded from the SAVE menu, as I find trash I knock it out via the LEARN menu using the small cursor and the the reject option, it can be very specific.
If I am hunting for coins, I will go to advanced and load a saved program in-which I have scanned my collection of new and old coins. The Explorer will reject all other targets, it will learn to accept or reject any target that is scanned accross the search coil.
What has helped me alot is Andy Sabisch's book Mastering the Minelab Explorer XS & S. I also bought a DVD on the Explorer Training Presentation. TB