fetching data from an executable that I do not have the source

I have to pass data to a textbox in an executable program of which I do not have the source. I click the submit button, then pass the data in the results textbox back to my program. Using the process class, I have successfully called the program, passed the data, tabbed to and clicked the submit button. The problem is that the result is displayed 4 textboxes down from where I submitted and cannot find a way to navigate to it to retrieve the data. The original programmer did not place tabs on the textboxes. Any way to get this data?

Thanks,
angela