INT 31H 050aH: Query Memory Block Size and Base

                                                    Compatibility: DPMI 1.0+ 
 Expects: AX    050aH
          SI:DI memory block handle
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 Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
          SI:DI size of memory block, in bytes
          BX:CX base address of memory block
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    Info: Returns the size of a memory block that was previously allocated
          via INT 31H 0501H or INT 31H 0504H.

See Also: DPMI API
          INT 2fH: Multiplex Interrupt
          DOS Functions
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