The first program one puts on a computer to be able to use it for whatever program or purpose they want is one called an Operating System (OS). In the 80s-90s the OS was then called DOS and was a text or command type OS – type in that you want to open a picture and it opens it. Next came a more visual OS called Windows; it became the standard for PCs because it most closely represents the functions for operating a computer. The mouse is essential for most to operate Windows.

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