AutoCAD 23.1 Crack + Keygen Full Version Free Download (2022)
The first commercial computer-aided design (CAD) product to be developed was a program called Houdini (for “Humanoid On-Line Design”), which was developed at the University of California, Berkeley (UC Berkeley) by members of the computer science department led by Douglas Engelbart. The first version of Houdini was released in March 1975, after seven years of development. In the late 1970s, Houdini was used by a group of students at UC Berkeley to model and simulate the design of the British aircraft Harrier.
At this time, however, computer graphics were considered to be just another engineering technique to supplement human skill in the design and development of mechanical systems. As a result, the design of the user interface (UI) for Houdini was poor. The task of designing a UI was left to members of the computer science department.
The UI for Houdini is a primitive metaphor that involves the use of an overlay diagram and a collection of icons representing shapes, tools, and functional elements. For example, the overlay used in Houdini is a window that contains five basic shapes: rectangles, parallelograms, trapezoids, triangles, and circles.
The symbols were chosen by Engelbart to represent the top level functional units in the system, which at the time were “Rectangle,” “Parallel,” “Trapezoid,” “Triangle,” and “Circle.” To access any function, the user must first determine which functional unit the user is trying to access. In this way, the user must learn which shape is relevant to the function they wish to perform.
In addition to the five basic shapes, the overlay diagram in Houdini supports four tools for performing tasks: “Knife,” “Laser,” “Pencil,” and “Eraser.”
By placing these symbols on the overlay diagram, users were trained to associate them with their most commonly used functions and tools. To assist in this process, icons were used to represent the new symbols.
When Engelbart and his group developed Houdini, they used a bulletin board system to allow users to post questions and comments in a shared electronic forum. In that context, the overlay model and icons became widely adopted, and continued to be used as the basis for a number
AutoCAD 23.1 Keygen Free Download
History 
The history of AutoCAD Full Crack is split into several different periods:
Early history 
Originally, AutoCAD was used for architectural design. Because the invention of AutoCAD was based on the development of the first object-oriented programming language in history, the history of AutoCAD, and other products based on it, is also the history of object-oriented programming (OOP).
Two concepts were key to AutoCAD's development and continued success:
 Object-oriented programming (OOP) 
 Object-based architecture (OBA) 
The origins of both the AutoCAD object-based architecture (OBA) and object-oriented programming (OOP) was principally influenced by John Backus's 1955 seminal paper "Report on a General Programming Language". Backus had a strong background in computing theory and was very interested in building a programming language from first principles that would fulfill the demands of program development in the new field of AI. He also saw that the new field of computer aided design would benefit from a native object-oriented development environment to replace the cumbersome and error-prone task of transferring designs from pencil and paper to bit map.
The resulting language was the first software programming language to formally contain the concept of an object (see section The origins of object-oriented programming) and the first to provide, within its implementation, the design philosophy of an object-oriented programming language, as represented in Backus's paper.
Backus suggested that the new programming language be called BACKUS-NOVA for "Backus-New objects". It was, however, decided to name the new language AUTOCAD, thus the term "OBA" was born.
1950s 
The earliest development of AutoCAD was driven by what was known at the time as CAD systems, that is, systems for the design and creation of two-dimensional drawings. AutoCAD was the second such CAD system to reach the market, after the somewhat dated McKone CAD. The third early CAD system, the first to be released, was called Graphic, which started development in late 1954 but was not released until 1955. Graphic was a commercial product and was the first CAD system to be released.
The intention of the developers of the first two CAD systems was to create CAD systems that could substitute or support for the architect's tools such as the drafting board and draftsman's pencil. In the early days, the CAD systems were aimed primarily at architectural and
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