DOS Protected Mode Interface
(DPMI) The method which Microsoft prescribes for a DOS program to access
extended memory under a multitasking environment, e.g. Microsoft Windows. This
service is provided by the HIMEM.SYS driver on IBM PCs.
The DPMI specification was finalized in 1990. The specification itself is
available from Intel Literature Sales.
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].
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