s and guidelines to help the user to figure out the spacial layout of a graphic space. To aid the user's mouse movement, the rulers can constrain the mouse's movement to certain lines.</P>
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To work with the basic ruler set-up, you don't need to know much about GEOS other than the basics of objects and messaging. However, for certain customizations, you will probably need to know something about GenViews and notifications they pass on to linked objects.</P>
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