A link between the computer system and the operating system(s) installed or loaded on it. An operating system is 'installed' ...

A link between the computer system and the operating system(s) installed or loaded on it. An operating system is 'installed' on a computer system, when placed on one of its storage extents - for example, copied to a disk drive or downloaded to memory. Using this definition, an operating system is 'installed' on a NetPC when downloaded via the network.