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INT 31 - DPMI 0.9 API - protected mode - UNLOCK LINEAR REGION
        AX = 0601h
        BX:CX = starting linear address
        SI:DI = size of region in bytes
Return: CF set on error
            none of the memory is unlocked
        CF clear if successful
Notes:  pages at beginning and end will be unlocked if the region overlaps them
        memory whose lock count has not reached zero remains locked
SeeAlso: AX=0600h