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INT 31 - DPMI 0.9 API - protected mode - RESIZE DOS MEMORY BLOCK
        AX = 0102h
        BX = new block size in paragraphs
        DX = selector of block
Return: CF set on error
            AX = DOS error code (07h,08h,09h) (see INT 21/AH=59h)
            BX = maximum block size (in paragraphs) possible
        CF clear if successful
Notes:  increasing the size of a block past a 64K boundary will fail if the
          next descriptor in the LDT is already in use
        shrinking a block past a 64K boundary will cause some selectors to be
          freed
SeeAlso: AX=0100h