that's more of a statement than a question.
the strong rope i think you mean is called sash cord and it is weighted to draw the weight of a sash window.
the cord is hidden behind the frame so it can be barely seen, but is simple to repair if needed.
in some houses in Europe you cannot remove original sash windows as they are historically protected and there are specialist tradesmen you can call to repair them.
hope that helps
See the related link below which covers the construction of window frames including some interesting cross sections of wooden window frames including provision for pulleys and sash weights and views showing frames for brick, stone and wooden or frame walls.
it is strong enough to hole the pieces together.
The top horizontal element of a window frame is the head. The bottom horizontal element of the window frame is the sill.
Window frames are usually made of aluminum.
because it is very strong substances.it is suitable for frames as it can carry out the weight for many years and even iron windows .
Because they are easier to make and adequately strong. There is no point making them solid.
You can purchase wood window frames online with ease. All you have to do is type wood window frames online and find the website that suits the customer.
They are made of compounds not elements unless they are Iron or Aluminum window frames. Most window frames were made of wood but UPVC is becoming more popular.
Window frames used to be made from steel but aluminium is lighter and does not rust.
Window frames for homes should not be made of steel because of the danger of lightning strikes. This is one of the reasons why window frames are made of either wood or aluminum. Steel also has the potential to rust if not treated properly.
window manager
because it does not rust