Draw a Window and Select Entities on a Model
- Create the window by adding window points to the screen with your mouse cursor.
 - To change the size and shape of the window, pick a point with your mouse cursor and drag it until the desired shape is achieved.
 - 
                Click inside the window to select all the interior entities.
                The entities are highlighted.
 - 
                Click outside the window to select all the exterior entities.
                The entities are highlighted.
 - 
                To delete a point from a window, with the mouse cursor, pick the point that you
                    want deleted.
                The point is removed from the window.Note: Depending on your mouse control settings, the mouse button and additional controls set to create a window and select entities from the screen will vary.