Compatibility: DPMI 1.0+
Expects: AX    050aH
SI:DI memory block handle
                                                                  
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
                                                                  
Info: Returns the size of a memory block that was previously allocated

See Also: DPMI API
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INT 31H 050aH: Query Memory Block Size and Base