Write to a separate text window

[Zerco]

I'm trying to write a program that will read from a simple text file, take that information and store it in an array, then write to a different application.

Steps I want it to do are:

1. Run the program
2. Have user select which text file to use
3. Copy the text to an array
4. Find the text box in the other application (it's a java app unrelated to me)
5. Write the text to that window

Kind of unsure where exactly to put this because I'm primarily using Windows but I'd like to keep it untied to any specific OS unless necessary.

Appreciate any tips or advice to where I should start.

[tolga gerekci]

In windows:

Get the hwnd value of child window(eg. Text box)
Use messages and write to this window.

Note: every text box, button, ... is a "window".