Identifies the Operating System.
common-lisp
software-type => description
| description | 
A string or  nil. | 
The function software-type returns a string representing a generic name of the Operating System, or nil if this cannot be determined.
On Windows, software-type returns "Windows NT". For more detail, use software-version.
software-type in the Common Lisp HyperSpec
software-version
LispWorks® User Guide and Reference Manual - 01 Dec 2021 19:30:30