How to install windows?

In every house,there are a lot of windows.Windows are normally installed in an opening created in a building surface by either nailing the brick molding of the window to the building surface or by nailing the nail fin of the window to the building surface.

In those windows which have a nail fin, the nail fins are normally installed on the window frame at the nail factory and extend outwardly from the window frame. The outwardly extending nail fins of the conventional windows make it somewhat difficult to ship the window frame from the nail factory to the building site due to the increased height and width of the window. The conventional nail fins do not allow the windows to stand by themselves, unaided. They require special blocking or packaging, or must be leaned against a support. Further, the conventional nail fins are frequently damaged during shipment. Yet another disadvantage of the conventional nail fins is that carpenters are frequently injured when handling the nail fins due to the protruding portions thereof and the sharp surfaces thereon.http://www.seekpart.com/general-mechanical-components/moulds/nail+factory.html