how we can pass the textbox value from Other user defines the GUI Application to MT 4 ?

 

I have developed the  an application in C#.net with textbox and send button . when user click on button then textbox value sends to the MT4 terminal for processing .

Similarly how we can get the data from MT 4 to text box of my application ?

Please Help me out? 

If any one have the little running application that performing the same functionality then please provide the running source code ? 

 
How does your independent application send information to the terminal?