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Encyclopedia > VCPI

DPMI is the method which Microsoft prescribes for a DOS program to run in protected mode and to access extended memory under a multitasking operating system like 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) was an earlier and incompatible method for doing the same thing.

It also had a more limited scope, in that it basically only allowed a protected mode DOS program to run at all when such program was started from DOS already running inside a virtual 8086 mode task, typically because a memory manager was installed and operating as a virtual [mode] control program for the processor. Because the virtual 8086 mode fully isolates programs from the hardware, without some support from the control program, it is not possible for another program to switch to protected mode by itself.

This article was originally based on material from the Free On-line Dictionary of Computing, used with permission. Update as needed.

  Results from FactBites:
VCPI (839 words)
VCPI added an e-Procurement Solution offering in May. “The first step is for the client to select the standard configurations they need for their desktops, printers, and laptops.
VCPI is also capable of bringing in back-office accounting solutions.
VCPI is planning to incorporate automated technology management tools in preparation for its next wave of growth.
Case Study- VCPI Takes Network Security to the Network Security to the Next Level (290 words)
Because VCPI’s clients face strict regulations relating to the health care industry, VCPI works diligently to educate and prepare clients for implementing security and regulatory best practices.
As part of this focus on security, the VCPI team regularly reviewed security event data on their own network, but faced many challenges when working with large amounts of data.
To help correlate and respond to security events on their own networks, VCPI needed a solution that would help them analyze massive amounts of data in a short period of time.
  More results at FactBites »



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