The window frame holds the window sashes in place. In all but fixed windows, the sashes slide up and down (in double-hung windows) or swing in or out (in casement windows) from the frame.
Fiber is the best material for window frames and provides the best insulation. Although it is attractive, water and sunlight can take their toll on fiber frames. Even if their integrity isn't compromised by severe weather, fiber frames are not need to be repainted from time to time to keep up their appearance
A Frame is a top-level window with a title and a border. The size of the frame includes any area designated for the border. The dimensions of the border area may be obtained using the getInsets method.
Choosing window frames is as important as choosing the window that goes into them. You need to make sure that the type of frame you choose is well-suited to both the area of your home you wish to install them and to the type of window you wish to use with them.