A pen is a graphics tool that an application for Microsoft Windows uses to draw lines and curves. Applications that draw use pens to draw freehand lines, straight lines, and curves. Computer-aided design (CAD) applications use pens to draw visible lines, hidden lines, section lines, center lines, and so on. Word processing and desktop publishing applications use pens to draw borders and rules. Spreadsheet applications use pens to designate trends in graphs and to outline bar graphs and pie charts.
Each pen consists of three attributes: style, width, and color. While no limits are imposed on the width and color of a pen, the pen's style must be supported by the operating system.
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