I've done something like this (but using visual basic becouse I was lazy, but the same technique can be used with C#)
I used txt files to comunicate with one program to another, course it's not the fastest way to do it, MQL4 can't send/recieve files faster then a per tick basis, plus the data has to be convertedfrom the ram, to a txt file on the HDD, then converted back to data in the ram, but unless you need blazing fast comunication, it'll work
and incase your wondering, i have not found a way yet to communicate via Dll's.
Hope that helps.
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Simply I want to devlop only GUI in C#.net and passing as input to MT4 terminal to draw the indicator and send the order to exchange. How we can achieve this functionalities ? Here is no issue of client and server communication bcoz C# application and MT4 terminal are running on same machine. I want to know how we can pass the input from C#.net application to Mt4 terminal for further processing and how we can get the data from MT4 terminal to C#.net application? please resolve this problem?
Here multiple instance can be handled by C#.net GUi?