The Common Lisp function software-type returns a generic name for the Operating System. The Common Lisp function software-version returns information about the version of the Operating System.
In particular software-type cannot be used to distinguish between different versions of Windows, whereas software-version allows you to identify variants such as Windows Vista, Windows 7, Windows 8, Windows 10 and so on. See the manual pages for details.
LispWorks® User Guide and Reference Manual - 01 Dec 2021 19:30:24