Windows — the most simple method of penetration into the home. Break glass is not to select the keys, not to break the locks-shit. And even if you install metal lattices on the windows, they will not save from the thief. The neighbors may not hear when the grate is broken with a car or tractor, or cut off. But if you are in the house and a fire begins, then the fastest way for salvation will be closed — it will not work through the grilles to the street.