It depends on the licensing agreement that the software company offers.
The Microsoft answer would be generally NO.
Many other operating systems are distributed under different agreements and may allow usage on several computers.
MS-Dos
MS-DOS was the first widely used operating system
Yes. As of 2015, Android has the largest installed base of all operating systems.
That depends on the licensing of the associated operating system. Most Windows licenses only allow one computer per copy. Mac OS X is sometimes available in a family pack for up to three computers. And most Linux distributions can be installed on as many computers as you want.
MS-DOS
Linux is an operating system for the computer. You can purchase computers that already have Linux pre-installed on the computer. Select Dell computers come equipped with Linux.
The Macintosh Operating System (OSX and variants) is only supported on Apple Macintosh computers. There are hacks which will allow MacOS to be installed and run on PC systems, but this is not supported and may be unstable.
For computers the term OS refers to Operating System.
Desktop computers can only run if they have a functioning operating system. The size of moden operating systems means that it can only be installed from a CD or DVD.
This depends on the licence that came with the software. Some operating systems do allow many copies. For example, the various kinds of Linux are free to install on any number of computers.Microsoft, however, does not issue licences that allow any of its operating systems to be installed at the same time on two different computers. To do so is software piracy and is illegal.
An integrated accounting system is one that works along with your computers operating system. Easily installed into your computer, it can be up and running in a matter of minutes.
Fable III is only available for the XBox 360 and computers running the Windows operating system. If the Mac has an Intel processor and has the Windows operating system installed then it can run Fable III.