Constant
Constant specifying which variant of an operating system the current machine is running, where relevant.
Symbol.
See Description.
operating-system
operating-system
This constant is a symbol value distinguishing between variants of the operating system identified by $os-name, where relevant; otherwise it has the same value as $os-name. On Windows, the possible values are #"win3.1", #"win95", #"win98", and #"winnt".