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Digital data flow in AutoCAD Serial Key is more fully explained on this page, but for new users, the AutoCAD Product Overview provides a good introduction.
Numeric and Variable Data
All data in AutoCAD are represented as numbers or variables, and stored in the memory of the computer, so that the data can be accessed or manipulated.
The way the data are stored is a bit complex, so this section will cover both the general way all data are stored, as well as the specific way that the data that makes up objects (or layers) are stored.
Any data that are made up of letters or numbers, such as the letters that make up a drawing or the numbers that make up the dimensions or other attributes of an object, are called numeric data. Numeric data are stored in the computer's memory as 1s and 0s. In many cases, the size of the numeric data being stored is not as important as the arrangement of the bits in memory.
For example, when an individual drawing contains a few thousand lines and text, each of these elements of the drawing will occupy a set number of bits in the computer's memory. But for a project that will contain thousands or even millions of drawings, the memory used for each drawing will be a set number of bits. The arrangement of the bits within each drawing is the object's Data Type, and this arrangement is used when you load the drawing into AutoCAD.
You may already know the answer to this question, but for the more general audience, the following explains the process for storing data in a drawing in the simplest way possible.
All data are represented by numbers, and stored in the memory of the computer. These numbers are organized into sets called data frames. A data frame holds a number of bits, and each bit represents a digit. For example, a "3" in binary is represented by the digit 1, 0, 1, 0, 1, and so on, with each 0 representing a 1 and each 1 representing a 0. A binary digit is the basic unit of data in AutoCAD.
Data frames are organized into sets called blocks. A block is a group of numbers that are considered to be a single unit of data storage. All data stored in AutoCAD are organized into blocks.
The first number in a block is called the first block number or simply the first number. It determines the order in which the data are stored in the block. The last
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A number of plugins are available on the application store Autodesk Exchange Apps and some are listed on AutoCAD homepage and Autodesk Exchange website.
ObjectARX
AutoCAD's ObjectARX supports a number of programming languages including:
 Visual Basic
 Visual C#
 Delphi
 Pascal
 AutoLISP
 AutoCAD Python
 AutoCAD VBScript
History
AutoCAD started in the early 1980s, as a desktop CAD system. It was originally named "Auto_Draft" and was developed by Aldus. In 1991, Autodesk bought Auto_Draft and renamed it AutoCAD. Subsequent versions followed each year. The first product for the Windows platform was AutoCAD 1, with the first release of Windows 3.0.
AutoCAD LT
In May 1998, Autodesk released AutoCAD LT (stands for "Light-Trained"), an "intelligent" line drawing editor. It was a serious departure from the traditional drawing editor approach to drawing, wherein drawings were made using a pen and paper and then imported to the computer.
AutoCAD LT was heavily marketed, with the tag line: "Don't leave home without it". It included features like a digitizing pad, revision markers and "drag and drop" technology, which was a radical departure from the traditional pen-and-paper method of drawing.
AutoCAD LT has seen some minor updates, including:
Version 2
Improvements to the digitizing pad (ledger functions to rotate and scale, etc.),
Version 3
Enhancements to the digitizing pad (grant freeform pen movements and the ability to change the cursor),
Version 4
Integration with the same Microsoft office suite as the desktop version of AutoCAD, which allows running AutoCAD LT drawings in the desktop version, and
Version 5
Redesign of the drawing interface and environment
AutoCAD LT has become generally less popular, because of the high cost of ownership. It is still, however, used in high volume engineering fields.
AutoCAD LT has been superseded by AutoCAD 2016.
AutoCAD 2010 
AutoCAD 2010 is a 32-bit version of AutoCAD LT, released as a service pack for AutoCAD 2006. It was the first release to be delivered over the Internet.
AutoCAD 2010 introduced
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