Ema is a mt4 (MetaTrader 4) indicator and it can be used with any forex trading systems / strategies for additional confirmation of trading entries or exits.
(downloadable file Ema.rar contains Ema.ex4 and Ema.mq4)
Free Download Ema mt4 indicator 
How to install Ema in forex trading platform metatrader 4?
- Extract the downloaded Ema.rar.
- Go to “File menu” in Mt4 trading platform and click “open data folder”. Open Mql4 folder and open the indicators folder.
- Now paste the Ema.ex4 and Ema.mq4 files into indicators folder and restart the MetaTrader 4.
