As requested by @andyj (https://www.prorealcode.com/prorealtime-indicators/m-oscillator/), this is the code to screen all stocks whose Signal Line crosses over 0:
Period = 14 //Number of Periods
ct = close //Today's close
S = 0
FOR i = 1 TO Period
cp = close[i]
r = (ct - cp) > 0 //R = Today's CLOSE - Previous Day's CLOSE, 1 = today > yesterday
IF r = 0 THEN
r = ((ct - cp) < 0) * -1 //R = Today's CLOSE - Previous Day's CLOSE, -1 = today < yesterday
ENDIF
s = s + r //Sum up all r's
NEXT
Ema5 = ExponentialAverage[5](s) //Histogram
Ema3 = ExponentialAverage[3](Ema5)//M-Oscillator
Ema3b= ExponentialAverage[3](Ema3)//Signal Line
CrossOver = Ema3b CROSSES OVER 0
SCREENER[CrossOver](volume AS "Volume")