The top, side jambs, and the sill make up what is often called the main frame of the window. This is the part of the framework that is attached to your home and holds the glass panels or sash.
or "Master Frame" - the jambs head and sill members of a window make up the main frame, these are commonly the heavier and therefore more expensive components in a window.
computer that is the heart of a network of computers or terminals which allows hundreds of people to work at the same time on the same data. It requires a special environment - cold and dry.