A Windows application can use drawing tools when it creates output: a bitmap,
a brush, or a pen. An application can use the pen and brush together, outlining a
region or object with the pen and filling the interior of the region or object with the brush. GDI allows the application to create pens with solid colors, bitmaps with solid or combination colors, and brushes with solid or combination colors. (The available colors and color combinations depend on the capabilities of the intended output device.)