AutoCAD 2005: One Step at a Time, Part III

Think way back to our discussion of layers in Lesson 6. I explained layers by referring to the presentation method Encyclopedia Britannica used to detail the human body (plastic overlays with the different systems of the body). This is also the idea behind externally referenced drawings Xrefs.
There is, however, quite a difference between layers and Xrefs. We use layers, as you know, to control the display of, and differentiate between, objects in a drawing (much as we used linetypes and widths on the drawing board). On the other hand, we use Xrefs to save drawing time and computer memory by sharing information (much as Britannica shared the outline of the human body among the various system overlays).
| Note | When working with Xrefs, file location is a critical consideration. For the exercises in this lesson to work properly with the files provided, the files must be located in one of two places:
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