INT 31 P - DPMI 1.0+ - FREE SHARED MEMORY
        AX = 0D01h
        SI:DI = shared memory block handle
Return: CF clear if successful
        CF set on error
            AX = error code (8023h) (see AX=0000h)
Notes:  handle becomes invalid after this call
        DPMI maintains separate global and virtual machine use counts for each
          shared memory block; when the global use counts reaches zero, the
          block is finally destroyed
SeeAlso: AX=0502h,AX=0D00h

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