How can I write multiple rules to system tester's buy (or sell) box? For example: I want to test to buy when Williams%R crosses it's line BUT only when faster MA is above the slower MA. I tried to write: cross(Williams%R,X) AND Fast_Mov > Fast_Mov (of course this ain't the right code :)) clearly the AND is wrong because it produced 0 buy signal although I can see looking at the chart that there should be good signals. Should I use WHEN or IF or something like that?