hi, i´m a student from Costa Rica... and my teacher give us a extra-class work, we need make a graphical interface so if there is someone who can give us a hand with some tutorial or book(PDF) or something like that, we need learn how make a window, a button, and how to call one function if the user give me some data like a list and i return a string...
please help... I can´t find anything in others sites.

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