By selecting software which can function on a number of types of hardware,the user has the flexibility to more fully take advantage of rapid changes in the hardware market, i.e., decreasing prices with improved performance. This is particularly true for the personal-computer-based CAD systems. In fact, most of the major providers of CAD software for drafting provide only software, with the users acquiring the hardware and operating system independently. Today, however, many vendors have decoupled the hard-ware and software, which allows the software to run on a number of hardware platforms. In these cases, the CAD software was designed to operate specifically on the hardware provided by the vendor. Traditionally, many CAD systems were provided by the vendor as a turnkey system that included both hardware and software.
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