>No, it didn't work. Basically, I just sent the function back to the browser from the backend, which is suppose to give the same thing and the focus goes back to the initial window. I also tried to use window.history.back() syntax instead of the window.history.go(-1) syntax. It gave the same result.
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>The focus goes to the initial window as soon as the called window has finished loading all of its frames. Might it be related?

Sorry it didn't work for you.
If you have a code snippet from your actual page(s) and the sequence in which the server returns it/them, that would be helpful; I am now curious as to why it doesn't work in your scenario.