More than one user can use the mainframe at once.
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Assuming that we are only talking about the personal computer (PC) market, before Microsoft's Windows operating systems, Microsoft's Disk operating system, or DOS, was used. Before that, CP/M was a popular computer operating system.
The features of mainframe computers include main board, processor, RAM, ROM and hard drive among others. These are the parts that enable a computer to process data.
Hardware - the physical components, both internal and external, that make up a computer. Operating System - a set of computer programs that manages the hardware of a computer. An operating system controls the resources on a computer, including memory and disk storage. An example of an operating system is Windows XP. Application Software - programs loaded on the computer to perform a specific function using the capabilities of the computer. An example of application software is a word processor or a computer game
operating system
Windows is an operating system produced by the Microsoft company. Windows is not a computer or a company. The first Apple computer was sold in July 1976. The first version of Microsoft's Windows operating system was sold in 1985.