Windows NT 3.1 operating system
Microsoft's first version of Windows NT, released in September 1993, price UKP 395, after having been in beta-test for as long as anyone could remember.
The person responsible for VMS on the DEC VAX [who?] was also responsible for Windows NT. Incrementing each letter in VMS yields WNT.
(http://win2000mag.com/Articles/Index.cfm?ArticleID=4494).
(2000-08-12)