Which tells me that my English is still worse than I thought...
About copying, I just think, someone who needs this tut will be glad to read that copying func_window/scriptobject-pairs makes the key target(name) count up automatically from t01, t02 up. This seemed to be unfamiliar to some in the post and saves much time.
Something else which was a little confusing for me (and my English knowledge) was about selecting textures: Beginning mapping I had some trouble with these breakable windows, because I didn't know that I MUST use textures with the SAME name but which MUST end with _frame and _broken. Maybe too obvious now...
Sometimes when copying windows the textures don't stay where they belong, so after having put those copies to their new place, one should always press CTRL+F to make them fit again. Isn't much work and there isn't this frustration after having compiled the map and find them wrong...