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Contents
Installing AutoCAD
AutoCAD software is distributed on a DVD-ROM or CD-ROM. Insert the media into your computer and double-click the "install.exe" icon to start the installation process. A series of installation screens will appear, asking you to confirm your choices. You will be prompted to agree to license terms, enter a product key (if you have one), and then select an installation location. You will then be prompted to insert a disk to begin the installation process. AutoCAD will launch, and you will be given the opportunity to choose language and keyboard type.
AutoCAD 2018-X version in 64-bit Windows, PDF, and ARB formats are free of charge for students, individual designers, and students with a valid institutional license.
AutoCAD 2016 version in 64-bit Windows, PDF, and ARB formats are free of charge for students, individual designers, and students with a valid institutional license.
AutoCAD 2011 version in 64-bit Windows and PDF formats are free of charge for students, individual designers, and students with a valid institutional license.
AutoCAD 2010 version in 32-bit Windows and PDF formats are free of charge for students, individual designers, and students with a valid institutional license.
Installing AutoCAD on the Mac
To install AutoCAD on a Mac, download the file "autocad.pkg", unzip it, and drag the folder "autocad.app" to the Applications folder. Double-click "autocad.app" to start the installation process. A series of installation screens will appear, asking you to confirm your choices. You will be prompted to agree to license terms, enter a product key (if you have one), and then select an installation location. You will then be prompted to insert a disk to begin the installation process. AutoCAD will launch, and you will be given the opportunity to choose language and keyboard type.
If you have multiple operating systems on your Mac, you may be prompted to select which operating system to use to start the installation process.
If you have multiple operating systems on your Mac, you may be prompted to select which operating system to use to start the installation process. The easiest way to install AutoCAD on a Mac is through a bootable USB drive or DVD-ROM, then reboot to the CD or DVD drive.
Installing AutoCAD for
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Nested Groups 
A nested group is a group with children groups. A child group can itself have a child group, and so on.
If, for example, a drawing has a group named "Projects" within it, then all of the drawing's groups, including "Projects", are nested within the drawing. If that drawing is part of a much larger drawing, then that larger drawing is a nested group of itself. 
This technique is commonly used for:
 complex/large drawings, to prevent cluttering up the main drawing with many small groups
 design documentation, e.g. showing models, building plans
 automation of many groupings into one, such as routing, milling, engineering calculations
 creating a common framework for multiple similar drawings, then allowing the user to place drawing elements only once
By default, all drawing groups are nested one level deep. A user can change this setting for each group. (In the group properties dialog box, on the Group tab, in the group nesting section.)
Relationships 
Relationships are connections that exist between objects, such as components, to an entity (such as a drawing).
Within AutoCAD's object-based model, relationships act as a toggle between components.  When relationships are selected, then any component linked to another component is shown in that drawing's component window, such that if a component is linked to multiple components, then all of those components are listed.
A relationship does not require a physical connection between objects. For example, a line connected to a polyline, a block connected to a component, or a block connected to a component with a surface, will not appear in the component window for the drawing, since the objects have no physical connection.
If an object does not have any linked components, then it is not shown in the component window.
 Dimensions 
Dimensions can be used to set a size or length for an object.  However, dimensions do not physically exist in an AutoCAD drawing.  Dimensions are merely a number that describes the length of an object, and can be used to reference other objects.
In AutoCAD's object-based model, dimensions are assigned to objects and can be used in the following ways:
 Dimensions can be added and removed from objects
 User-defined dimensions can be created in a drawing
 Custom dimension classes can be created
By default, dimensions are stored in a drawing's attribute table.
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