[amibroker] Closing Price prediction for MACD crossing it's Signal

[binjobingo]

Hi ,
     Was Going throgh Mr Dimitris Tsokakis's Ema Crossover Predictions AFL

He had also written about Macd Roc value if one has to know if  MACD will cross 
it's signal.

Does anyone know the AFL to calculate the "CLOSEPRICE" so that macd crosses 
it's Signal ?

Thanks & Regards