provided by the HIMEM.SYS driver on
IBM PCs.
The DPMI specification was finalized in 1990. The
VCPI (Virtual Control Program Interface), which was an
alternative, and incompatible method for doing the same thing.
["Windows 3.1 Secrets", Brian Livingston, 1992, ISBN
1-878058-43-6, pages 280-281 and 302].
(1995-01-12)