(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]. (1995-01-12)