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Why do companies install support systems?

In 4 paragraphs long with 4-6 sentences each, why do companies install support systems? Provide two actual example.

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Support systems are installed as there are problems with existing systems. There are certain problems which are common to all commercial-release operating systems - that is, any operating system which has all of the following attributes: a)It costs money; b)Source code for the system is not available; and c)There are strict limits as to how the system may be copied. For example, Windows, MacOS, DEC Ultrix, Solaris, OS/2, and other similar platforms are commercial operating systems. Since commercial systems are a source of revenue for the companies who make them, some situations develop which are not necessarily advantageous to computer users. Most of these are directly ...

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