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  Window: This option, which is useful for zooming in quickly and precisely, zooms to a rectangular section of the drawing that you specify by clicking two points. The two points define the diagonal of a window around the area you want to see. The Zoom command’s Window option is not a click-and-drag operation, unlike in most other Windows programs and — confusingly — unlike in the Zoom/Pan Realtime Zoom Window option. To use the Zoom command’s Window option, you click to specify one corner, release the mouse button, and then click another corner.

  Realtime: Enables you to zoom in and out by starting a real-time zoom and then dragging the magnifying-glass cursor up (to zoom in) or down (to zoom out).

  Previous: Use this option to undo the last zoom or pan sequence (or both), returning to where you started. You can repeat this option to step through previous views, even if you create or edit objects after changing the view.

  Object: This option zooms in close enough to show selected objects as large as they can be displayed onscreen. Using Zoom Object is similar to examining selected objects under the AutoCAD microscope.