Between 1989 and 1990 an alternative specification was proposed under the name Extended VCPI (XVCPI) by a number of companies including Intel, Digital Research, Interactive Systems and Viewport to address some of the shortcomings of VCPI and better exploit the memory management and multitasking capabilities of the 386 processor. It was used by a small number of products including operating systems like Interactive Unix, Concurrent DOS 386 and Multiuser DOS. These efforts ultimately succumbed to the parallel development and publication of the DPMI specification in 1990, which addressed similar problems, but was compatible with the implementation of Microsoft Windows 3.0 to be released the same year.
Read more about this topic: Virtual Control Program Interface
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“No: until I want the protection of Massachusetts to be extended to me in some distant Southern port, where my liberty is endangered, or until I am bent solely on building up an estate at home by peaceful enterprise, I can afford to refuse allegiance to Massachusetts, and her right to my property and life. It costs me less in every sense to incur the penalty of disobedience to the State than it would to obey. I should feel as if I were worth less in that case.”
—Henry David Thoreau (1817–1862)