[NTG-context] footnotes with one *

I looked at two context manuals and can't find the setting to get footnotes with * instead of a letter or a number. I need 4 footnotes in 4 different pages, and I would like them all of them with one sigle * thank you Ciro ------------- * like this -- ======================================= "All problems are at the interface. Each one of them has a solution." from: "The Guitar Maker: An Exploration of Wisdom, Design and Love." A novel by C. A. Soto Aguirre. Pub. Date: October 2005.