Fingers only. You tap the notes, no picking or strumming. Think of it as trying to play keys on a stringed instrument.
Now here's the catch. It's in two different tuning systems. The low strings are in the middle.
The melody strings go low to high in fourths, like a guitar or bass, and are oriented in the way that will feel 'right side up' to your left hand as you lay it agains the side of the neck....But wait. You won't be playing those strings with your left hand. You will be reaching across them to play the accompaniment(sp?) strings which go low to high in fifths like a cello. And they will feel as if they are placed 'upside down'
So both hands will tap all their notes. Both hands will extend farther for high note than low And in general it is the most confusing instrument I own. I have had mine for many years and still can't really make use of it in the way it was intended.
Check out
www.stick.com for more information, possibly phrased more coherently, too.
Or look at the videos of Greg Howard making it look really easy at
www.stick.com/method/greg_howard1.wmv or
www.stick.com/method/greg_howard2.wmv
And you can have mine for a natural finish Cort JPS5 or enough money to buy one.