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EMM386.EXE version 4.45, which ships with MS-DOS 6.0, and EMM386.EXE version 4.48, which ships with MS-DOS 6.2x, is a Virtual Control Program Interface (VCPI) provider even when the NOEMS switch is specified. With VCPI support enabled, EMM386.EXE supplies an upper memory frame buffer for the VCPI applications to use. When an application checks for EMS memory, it may see this buffer and believe it to be an EMS page frame, and thus report that EMS memory is available when it is not. When the NOVCPI switch is added, it disables this upper memory buffer, thus disabling what the application is seeing as EMS.

NOTE: MS-DOS 6.0 and later can maintain VCPI server functionality with the NOEMS switch specified; this feature was not provided in versions of MS-DOS prior to 6.0.

VCPI support can exist without a page frame. For example, EMM386 in MS-DOS 5.0 (version 4.44) provided VCPI support by using the "frame=0" switch. MS-DOS 6.0 and later can achieve the same result using the NOEMS switch and the NOVCPI switch together.

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