WHAT, WHERE, AND HOW
First we must determine what trim to paint, that is, the proper names of what we will paint. Our only other option is to refer to them as "whatjamacallits" and "thingamabobs" and that could get confusing.
Like about ninety percent of the homes in the United States the windows in our room are of the double hung sash type.
The parts consist of two moveable "sashes", one upper and one lower. Each sash holds six glass panes that are divided by wooden channel strips called "mullions".
The window unit is framed on the sides and top by wood moldings collectively called the "casing".
The bottom of the window has a little shelf called a "stool"and under that is a strip of molding called an "apron". (see figure #1)
There you have it, the anatomy of a window.