walterbyrd writes "At its annual shareholders’ meeting on January 19, 1983, Apple announced two new products that would play a pivotal role in the future of the company: the Apple Lisa, Apple’s original GUI-based computer and the precursor to the Macintosh; and the Apple IIe, which represented a natural evolution to the highly successful Apple II computer line." Link to Original Source
It appears that PL/I (and its dialects) is, or will be, the most widely
used higher level language for systems programming.
-- J. Sammet