There's no hard limit on the number of operating systems you can install. The limit will be dictated by the number of operating systems that support your hardware and the amount of space on your hard drive(s).
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Windows, Linux, Mac OSX are currently the three most popular computer operating systems. Other operating systems are Solaris, BeOS, Google Chromium os, and many more.
There are many types and brands of computer operating systems. Some of them include Windows, Apple OSX, Ubuntu, UNIX, Linux, and Android.
As computers have progressed and developed so have the operating systems. Below is a basic list of the different operating systems and a few examples of operating systems that fall into each of the categories. Many computer operating systems will fall into more than one of the below categories. GUI - Short for Graphical User Interface, a GUI Operating System contains graphics and icons and is commonly navigated by using a computer mouse. See the GUI definition for a complete definition. Below are some examples of GUI Operating Systems. System 7.x Windows 98 Windows CE Multi-user - A multi-user operating system allows for multiple users to use the same computer at the same time and different times. See the multi-user definition for a complete definition for a complete definition. Below are some examples of multi-user operating systems. Linux Unix Windows 2000 Multiprocessing - An operating system capable of supporting and utilizing more than one computer processor. Below are some examples of multiprocessing operating systems. Linux Unix Windows 2000 Multitasking - An operating system that is capable of allowing multiple software processes to run at the same time. Below are some examples of multitasking operating systems. Unix Windows 2000 Multithreading - Operating systems that allow different parts of a software program to run concurrently. Operating systems that would fall into this category are: Linux Unix Windows 2000
Real time operating system controls machinery and industrial equipment. Another is a mult-user system that allows many users to perform various duties.
Drivers are written for many operating systems.