AutoCAD 2008 User's
Guide > Choose a Work Process
Before You Begin > Create
Multiple-View Drawing Layouts (Paper
Space) > Control Views in
Layout Viewports >
Control Visibility in Layout Viewports
You can control the visibility of objects in layout viewports using several methods. These methods are useful for emphasizing or hiding different elements of a drawing, and for reducing screen regeneration time.
A major benefit to using layout viewports is that you can selectively freeze layers in each layout viewport. You can also specify default visibility settings for new viewports and for new layers. As a result, you can view different objects in each layout viewport.
Screening refers to applying less ink to an object when it is plotted. The object appears dimmer on the screen and on the plotted paper. Screening can be used to help differentiate objects in a drawing without changing the objects' color properties.
You can save time by turning some layout viewports off or by limiting the number of active viewports.
