Keltner Channels are explained in the book The New Commodity Trading System and Methods by Perry Kaufman and were first introduced in the book How To Make Money in Commodities, by Chester W. Keltner. The syntax for the formulas in MetaStockTM are The 10-Day Moving Average: MOV( (H+L+C)/3, 10, Simple ) Upper Keltner Band MOV((H+L+C)/3,10,S) + MOV((H-L),10,S) Lower Keltner Band MOV((H+L+C)/3,10,S) - MOV((H-L),10,S) ** All three formulas must be plotted. In the System Tester, a BUY or a COVER SHORT Signal would occur when: C > Upper Keltner Band and a SELL or a SELL SHORT Signal would occur when C < Lower Keltner Band ** Thus, the system is always either long or short. For interpretation refer to either of the two books listed above.