NeXTSTEP Release 3 Demo

(vid via digg.com)

NEXTSTEP is the original object-oriented, multitasking operating system that NeXT Computer, Inc. developed to run on its proprietary NeXT computers (informally known as "black boxes"). NEXTSTEP 1.0 was released on 18 September 1989 after several previews starting in 1986, and the last release 3.3 in early 1995, this info was from,(and more can be found there) Wikipedia, the free encyclopedia.