INT 2C P - RM386 v6.00 - CLOAKING - PROTECTED-MODE VIRTUAL DMA SERVICES
        AX = 002Bh
        CH = 81h
        CL = subfunction (02h-0Ch)
        other registers as appropriate for subfunction
Return: varies by function
        CF set on error
Note:   these functions are equivalent to the INT 4B/AX=81xxh subfunctions
          with the same numbers
SeeAlso: INT 4B/AX=8102h,INT 4B/AX=810Ch

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