How to know amount of EA on charts?

 
Only one EA on one chart.
See also Running MQL5 Program Properties
 
Rosh:
Only one EA on one chart.
See also Running MQL5 Program Properties
I mean the EAs are on different charts. Is it possible?
 
If one EA sell eurusd but another EA buy the same symbol, that's a problem.
 
song_song:
If one EA sell eurusd but another EA buy the same symbol, that's a problem.

If you're the author of all of these EAs, there are several things you can use:

1. Each EA uses different magic/comment for its own orders, so the other can check whether this is its own order or not.

2. Create your own locking system using GLOBAL variables or File I/O.